Learn Important Concepts and Skills of High School Statistics

Recent questions in High school statistics

angepepagiortzb 2021-11-27

A company collected data on 100 people with regards to their eye color and whether they were left-handed or right-handed. The data is given in the table below.
$\begin{array}{cc} E y e C o l o r \\ B r o w n & B l u e & G r e e n & T o t a l \\ Left-Handed & 10 & 5 & 5 & 20 \\ Right-Handed & 40 & 5 & 35 & 80 \\ T o t a l & 50 & 10 & 40 & 100 \end{array}$
(a) What is the probability that a person in this group has blue eyes?
(b) What is the probability that a person in this group is right-handed?
(c) What is the probability that a person in this group has blue eyes and is right-handed?

Pretoto4o 2021-11-27

The following table gives the scores of 30 students in a mathematics examination:
$\begin{array}{cc} S c o r e s & 90 - 99 & 80 - 89 & 70 - 79 & 60 - 69 & 50 - 59 \\ S t u d e n t s & 4 & 8 & 12 & 4 & 2 \end{array}$
Find the mean and the standard deviation of the distribution of the given data.

alka8q7 2021-11-27

Find mean and median for given data.
12,15,17,19,15,13,15,20,22,24,25,23,26,29,30

mronjo7n 2021-11-27

Data was collected regarding purchases at a major department store. For each customer making a purchase, the amount of the purchase and the method of payment was recorded. The data is summarized in the table below.
$\begin{array}{cc} U n d e r $ 50 & $ 50 - $ 200 & O v e r $ 200 & T o t a l \\ C a s h & 25 & 30 & 10 & 65 \\ Store Credit Card & 40 & 70 & 50 & 160 \\ Other Credit Card & 45 & 150 & 80 & 275 \\ T o t a l & 110 & 250 & 140 & 500 \end{array}$
Use this data to estimate the following probability.
Find the probability that a customer will spend under $50 on a purchase but will not use cash.
Give the answer as a decimal.
The probability is ?.

jippie771h 2021-11-27

Find Mean, Median, Mode, sample variance and range for following set of data:
$\begin{array}{cc} x & 0.23 & 0.36 & 0.56 & 0.89 & 0.76 & 0.77 & 0.81 \end{array}$

gonjenjemeb 2021-11-27

Compute r, the correlation coefficient, using the following data.
$\begin{array}{cc} x & 6 & 5 & 7 & 3 & 1 & 8 \\ y & 3 & 5 & 3 & 6 & 10 & 3 \end{array}$
$r = ?$

ambiguit 2021-11-27

A data set is formed by recording the sums in 400 rolls of a pair of a dice. A second data set is formed by recording the results of 600 draws of a ball from a box containing 11 balls numbered 2 through 12. Which of the data sets would you expect to have a smaller standard deviation? Explain.

shelbs624c 2021-11-27

If a class of qualitative data set with a class frequency of 70 is represented on a pie chart by an angle of 60 degrees, what is the total frequency of the data set if?
a. 360
b. 2,520
c. 420
d. 309

Fenian41 2021-11-27

In Yellowstone National Park, the geyser Old Faithful alternates between bursts of eruption, which typically last 1.5 to 4 minutes, and periods of dormancy, which last much longer. The table below represents the durations, in minutes, of 60 dormancy periods that occurred during a recennt year.
$\begin{array}{cc} 91 & 99 & 99 & 83 & 99 & 85 & 90 & 96 & 88 & 93 \\ 88 & 88 & 92 & 116 & 59 & 101 & 90 & 71 & 103 & 97 \\ 82 & 91 & 89 & 89 & 94 & 94 & 61 & 96 & 66 & 105 \\ 90 & 93 & 88 & 92 & 86 & 93 & 95 & 83 & 90 & 99 \\ 89 & 94 & 90 & 95 & 93 & 105 & 96 & 92 & 101 & 91 \\ 94 & 92 & 94 & 86 & 88 & 99 & 90 & 99 & 84 & 92 \end{array}$
1. Create a frequency distribution for the data that is grouped into 6 classes. There should be a column for relative frequency.
2. Calculate the mean of the grouped data.

urca3m403 2021-11-27

In a loan database, there are 10 loans to clients with 15 years of business experience. Also, there are 79 loans made to clients with a Graduate education. In the database there are 86 loans to clients with 15 years of experience or who have a Graduate education. How many loans were made to clients with a Graduate education who also had 15 years of experience?
Answer = ? loans

kursval7z 2021-11-27

The table to the right list the monthly price (in dollars) of a pound of coffee and a gallon of gasoline over a 6 month period. Find the popolation standard deviation of each set of data.
Find the population standard deviation of coffee prices.
Find the population standard deciation of gasoline prices.
$\begin{array}{cc} M o n t h & C o f f e e P r i c e \frac{$}{l b} & G a s o l i n e P r i c e \frac{$}{g a l} \\ J a n . & 5.29 & 3.99 \\ F e b . & 5.41 & 3.79 \\ M a r . & 4.87 & 3.05 \\ A p r . & 4.21 & 3.03 \\ M a y & 5.43 & 3.65 \\ J u n . & 5.06 & 3.54 \end{array}$

pamangking8 2021-11-27

The following data represent the planned rated capacities in megawatts (millions of watts) for the world’s 20 largest hydroelectric plants.
See Attachment
a. Construct a stem and leaf display for the data.
b. How would you describe the shape of this distribution?
$\begin{array}{cc} 18, 200 & 4, 500 & 3, 000 \\ 12, 600 & 4, 200 & 2, 940 \\ 10, 000 & 4, 200 & 2, 715 \\ 8, 370 & 3, 840 & 2, 700 \\ 6, 400 & 3, 444 & 2, 541 \\ 6, 300 & 3, 300 & 2, 512 \\ 6, 000 & 3, 100 \end{array}$

Sherry Becker 2021-11-27

I search a DNA database with a sample. Each time I attempt to match this sample to an entry in the database, there is a probability of an accidental chance match of 0.0001. Chance matches are independent. There are 20,000 people in the database. What is the probability I get at least one match, purely by chance?

ahgan3j 2021-11-27

A set of data is found to have a $μ μ = 10 and a σ σ = 2$ .
What is $σ 2 σ 2$ for this data set?
Suppose each data value was divided by 5.
What is $μ μ$ of the resulting data set?
What is $σ σ$ of the resulting data set?
What is $σ 2 σ 2$ of the resulting data set?

lilyta79jd 2021-11-27

Suppose that, on average, the number of car accidents in Hong Kong are 6 per day (which has 24 hours).
i. Determine the probability that at least χ accidents will occur in 12 hour period.
ii. In a two days, if there were 8 car accidents in Hong Kong, what is the probability that 2 accidents have occurred in the first 12 hours of the two days?

adOrmaPem6r 2021-11-27

Describe Bayes’ theorem?

Aufopferaq 2021-11-27

What is the probability of not tossing three tails with three fair coins?

scottyqegi 2021-11-27

Any normal distribution has a variance of one and a mean zero
Select one:
- True
- False

ofodse 2021-11-27

Random variables X and Y have the following joint probabilities: $P (X = 0, Y = 0) = P (X = 0, Y = 8) = P (X = 16, Y = 0) = P (X = 16, Y = 16) = \frac{1}{4}$
a)Make a table of the joint distribution of X and Y and add their marginal distributions to the table.
b)Compute Cov(X, Y). Are X and Y positively correlated, negative correlated,or uncorrelated?
c)Compute the correlation coefficient between X and Y.

luipieduq3 2021-11-27

The average price for a gallon of gasoline in the United States is $3.76 and in Russia it is $3.39. Assume these averages are the population means in the two countries and that the probability distributions are normally distributed with a standard deviation of $.25 in the United States and a standard deviation of $.20 in Russia.
What percentage of the gas stations in Russia charge less than $3.50 per gallon (to 2 decimals)?

As a rule, high school statistics help is quite hard to find because once a student starts looking for statistics help, it comes up with more advanced help in this regard. Taking this problem into consideration, we have collected some helpful high school statistics questions and answers that will meet the high-school level standards. Looking into these will help you to find the most suitable solution or post your own questions based on equations, data reports, and so on. Take your time to explore available high school statistics questions as these will be mostly similar to what you may have.

High school statistics

Statistics Projects for High School Students