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Question: given a frequency distribution of 10000 scores which has a...

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Given a frequency distribution of 10,000 scores which has a mean of 120 and a standard deviation of 15, 94.13% of those tested scored 135 or below.

T or F

The highway department conducted a study measuring driving speeds on a local section of the interstate highway. They found an average speed of mu=58 miles per hour with a standard deviation of 10. Given this information, what proportion of the cards are traveling between 55 and 65 miles per hour?

a .2580 or 25.80%

b .3759 or 37.59%

c .1179 or 11.79%

d none of these answers are correct

Given a frequency distribution of 10,000 scores, which approximates the normal curve and has a mean of 120 and a standard deviation of 15, what percentage of those tested scored 135 or below?

a.22%

b.84.13%

c.94%

d.15.87%

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