Retest Distribution

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have less than 5 accidents?

• 0.6915
• 0.1762
• 0.8238
• -0.93

The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 5.6 seconds?

• -1.33
• 1.33
• 0.88
• 1.02

Mary and Jim are comparing their height.  Men have a mean height of 71 inches with a standard deviation of 2.1 inches.  Women have a mean height of 68 inches with a standard deviation of 1.7 inches.  If Jim is 74 inches tall, and Mary is 71 inches tall who is relatively taller? (Look at Z Scores)

• Mary
• Jim

Find the area of the shaded region if the z-score is -0.3

• 0.6179
• 0.488
• 0.3783
• 0.3821

Find the area of the shaded region if the z-scores are -0.25 and 1.

• 0.4400

• 0.8413

• 0.4013

• 0.1587

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have more than 7 accidents?

• 0.3446
• 0.2856
• 0.4
• 0.6554

An algebra 2 test has 6 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 6 questions, what is the probability that you get exactly 3 questions correct? 

• 0.962
• 0.132
• 0.831
• 0.250

An algebra 2 test has 5 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 5 questions, what is the probability that you get at least 1 question correct?

• 0.2373
• 0.3955
• 0.7627
• 0.6045

Which one of these variables is a continuous random variable?

• The time it takes a randomly selected student to complete an exam.
• The number of tattoos a randomly selected person has.
• The number of women taller than 68 inches in a random sample of 5 women. 
• The number of correct guesses on a multiple choice test. 

Find the mean of the probability distribution.

• 85
• 83.2
• 87.1
• 84.4