Basic Distribution

Given a mean of 75 and a standard deviation of 7, what probability of scores are above 82?

• 0.341

• 0.815

• 0.158

• 0.025

Given a mean of 75 and a standard deviation of 7, what is the probability of a score being at most 68?

• 0.341

• 0.159

• 0.95

• 0.68

For a standard normal distribution, find a where 

P(Z < a) = 0.01. 

For a standard normal distribution, find a where 

P(Z > a) = 0.95. 

• 1.18

• 136

• 152

• 202

The mean GPA of students in a course at UCDavis is 3.2 with a standard deviation of 0.3. What percent of students in the course have a GPA between 2.9 and 3.8?

• 81.9%

• 47.5%

• 68%

• 95%

In a survey of young children, the mean height was 69.6 cm with a standard deviation of 3.0 cm. Find the minimum height in the top 17.5% .

• 70.0 cm

• 71.2 cm

• 72.4 cm

• 73.0 cm

A fair coin is tossed five times.

What is the probability of obtaining two heads?

• 5/32

• 2/5

• 5/16

• 3/5

• 0

What is the mean number of Heads?

• 6

• 7

• 8

• 9

• 10

A company makes electronic components for TV's.

95% pass final inspection (and 5% fail and need to be fixed).

120 components are inspected in one day. What is the expected number that fail in one day?

• 3

• 4

• 5

• 6

• 7