Which of the following z-scores is NOT outside the middle 68% of the data for a normal distribution?

• a.)
• -2.8
• b.)
• 3.8
• c.)
• 1.8
• d.)
• -0.8

Which of the following z-scores isNOToutside the middle 95% of the data for a normal distribution?

• a.)
• -3.4
• b.)
• 4.1
• c.)
• -1.4
• d.)
• 2.1

Which of the following z-scores isNOToutside the middle 99.7% of the data for a normal distribution?

• a.)
• -3.2
• b.)
• 2.7
• c.)
• 3.6
• d.)
• 4.1

Which mean, standard deviation, and x-value set corresponds to a z-score of -2?

• a.)
• x-value = 80
• mean = 90
• standard deviation = 10
• b.)
• x-value = 50
• mean = 60
• standard deviation = 5
• c.)
• x-value = 89
• mean = 80
• standard deviation = 9
• d.)
• x-value = 35
• mean = 21
• standard deviation = 7

Which mean, standard deviation, and x-value set corresponds to a z-score of 2?

• a.)
• x-value = 80
• mean = 100
• standard deviation = 10
• b.)
• x-value = 70
• mean = 60
• standard deviation = 5
• c.)
• x-value = 68
• mean = 60
• standard deviation = 8
• d.)
• x-value = 18
• mean = 25
• standard deviation = 7

Which mean, standard deviation, and x-value set corresponds to a z-score of 3?

• a.)
• x-value = 79
• mean = 70
• standard deviation = 9
• b.)
• x-value = 21
• mean = 21
• standard deviation = 7
• c.)
• x-value = 40
• mean = 50
• standard deviation = 5
• d.)
• x-value = 70
• mean = 40
• standard deviation = 10

Which of the following probabilities corresponds with a z-score of 1.27?

• a.)
• 0.4454
• b.)
• 0.1020
• c.)
• 0.8849
• d.)
• 0.8980

Which of the following probabilities corresponds with a z-score of -1.52?

• a.)
• 0.9784
• b.)
• 0.0216
• c.)
• 0.0643
• d.)
• 0.9357

Which of the following probabilities corresponds with a z-score of 1.27?

• a.)
• 0.4454
• b.)
• 0.1020
• c.)
• 0.8849
• d.)
• 0.8980

Arlene is looking at the height of giraffes. The average height is 16 feet, and the standard deviation has been determined to be 2.1 feet.

What is the probability of a giraffe that is shorter than 14 feet? Answer choices are rounded to the nearest whole percent.

• a.)
• 8%
• b.)
• 83%
• c.)
• 17%
• d.)
• 92%

Bruce is repainting his house. The average coat of paint lasts 10 years, and the standard deviation has been determined to be 1.4 years.

What is the probability that Bruce's paint job will last 12 years or longer? Answer choices are rounded to the nearest whole percent.

• a.)
• 8%
• b.)
• 98%
• c.)
• 92%
• d.)
• 2%

Jerry is looking at the lifespan of parrots. The average lifespan is 75 years, and the standard deviation has been determined to be 6 years.

What is the probability of a parrot that has a life span of 79 years or longer? Answer choices are rounded to the nearest whole percent.

• a.)
• 25%
• b.)
• 77%
• c.)
• 37%
• d.)
• 63%