Probability Statistics Exam Review

Assume that in your History class you have earned test scores of 78, 82, 56, and 72.  Only 1 test remains.  If you need a mean score of 75 to earn a C in the class, what must you score on the final test?

• 75

• 87

• 12

• 57

Find the mean and standard deviation (Sx) for the following data set:

89, 72, 100, 87, 65, 98, 77, 92

• 85, 12.5

• 75.3, 30.65

• 85, 11.7

• 88, 12.5

Find the z score if the mean is 80, standard deviation is 5, and x=87.

• -1.4

• 1.4

• -1.75

• 1.75

Find x if the mean is 20, standard deviation is 6, and z=1.32.

• 32.4

• 7.92

• -12.08

• 27.92

Assume that the math SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. If you score 400 on the math portion, what percent of those taking the test scored above you?

• 52%

• 84%

• 98%

• 92%

What data value is the upper quartile (Q3)?

• 64
• 62
• 66
• 58

You choose a marble out of a bag with the marbles above. Without replacing the first marble, you choose a second. Find the probability you choose a white then red.

• 3/50

• 1/12

• 1/5

• 1/15

An ice cream parlor has 6 different flavors. They have 4 toppings and 2 types of cones. How many possible ice cream combinations are there?

• 6
• 48
• 12
• 24

The chart below represents the number of marbles in a jar.
P(red or brown) = 

• 5/19
• 10/28
• 5/14

Which shows the sample space for flipping two coins?

• H, T
• HH, HT, TH, TT
• HH, TT
• Dime, Nickel