Suppose the current measurements in a strip of wire are assumed to follow a normal distribution with a mean of 10 milliamperes and a variance of 4. What is the probability that a measured will exceed 13 milliamperes?
Hint:
P(0 < z < 0.75) = 0.2734
P(0 < z < 0.5) = 0.1915
P(0 < z < 0.7) = 0.2580
P(0 < z < 0.55) = 0.2088
The table below shows the student population of a certain school
Gender | Grade 7 | Grade 8 | Grade 9 | Grade 10 |
Male | 100 | 90 | 70 | 60 |
Female | 120 | 100 | 90 | 70 |
One student is selected at random.
a) What is the probability of selecting a female or a Grade 10 student?
b) What is the probability of selecting a male or a Grade 7 student?