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