Z-Score Quizizz

The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds. Suppose that the standard deviation is 84 pounds. How many standard deviations from the mean would a steer weighing 1000 pounds be?

• 84
• - 1.81 
• 1.81
• 986.29

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Suppose your Stats teacher reports test grades as z-scores, and you got a score of 2.20 on an exam. What does that mean?

• You scored 2.2 standard deviations above the mean, which means you did above average.
• You scored 2.2 standard deviations below the mean, which means you did below average.
• You scored a 22% on your test.
• There's no way to determine how you did.

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The mean score on a stats exam was 75 points with a standard deviation of 5 points, and Greg's z-score was a -2. What was Greg's exam score?

• 55

• 85

• 65

• 95

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People with z-scores above 2.5 on an IQ test are sometimes classified as geniuses. If IQ scores have a mean of 100 and a standard deviation of 16 points, what IQ score do you need to be considered a genius?

• less than 140
• more than 140
• more than 120
• less than 120

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Yearling Angus steers had a mean weight of 1152 pounds with a standard deviation of 84 pounds. What's the actual weight of an animal whose z-score is - 1.5?

• 1026 pounds
• 1278 pounds
• 1020 pounds
• 1050 pou

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CCSS.HSS.ID.A.4

On North Street in Tewksbury, cars were traveling at a mean speed of 23.84 mph, with a standard deviation of 3.56 mph. One car's z-score was +3.2. How fast was that car going?

• 72.728 mph

• 12.448 mph

• 35.232 mph

• 32.563 mph

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Weights of yearling Angus steers have a mean of 1152 pounds and a standard deviation of 84 pounds. Which would be more unusual, a steer weighing 1000 pounds or one weighing 1250 pounds?

• 1000 pound steer
• 1250 pound steer

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The mean speed of the North Street cars was 23.84 mph and the standard deviation was 3.56 mph. Which would be more unusual, a car traveling 34 mph or one going 10 mph?

• Car going 34 mph

• Car going 10 mph

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A town's January high temperatures average 36^oF with a standard deviation of 10^o, while in July the mean high temperature is 74^o and the standard deviation is 8^o. In which month is it more unusual to have a day with a high temperature of 55^o?

• January
• July

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An incoming freshman took her college's placement exams in French and mathematics. In French, she scored 82 and in math 86. The overall results on the French exam had a mean of 72 and a standard deviation of 8, while the mean math score was 68, with a standard deviation of 12. On which exam did she do better compared with the other freshmen?

• French exam
• Math exam

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