In: Statistics and Probability
The GMAC Insurance company reported that the mean score on the National Drivers Test was 82.5 with a standard deviation of 3.3 points. The test scores are approximately bell-shaped. Approximately 68% of all test scores were between two values A and B. What is the value of A? Write only a number as your answer. Round to one decimal place.
Answer:
Given that:
The GMAC Insurance company reported that the mean score on the National Drivers Test was 82.5 with a standard deviation of 3.3 points.
= 82.5 , = 3.3
According to Emperical (68 - 95 - 99.7) rule,
Approximately 68% data falls in 1 standard deviation of the mean.
That is 68% data falls in the interval of
If 68% of all test scores were between A and B, the and
Put the values of and and find value for A