The gmac insurance company reported that the mean score on the national drivers test was 69.9 with a standard deviation of 3.7 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.

  66.2

Step-by-step explanation:

We know that the middle 68% of the distribution is between -1 and +1 standard deviations from the mean. -1 standard deviation is a score of ...

  69.9 - 3.7 = 66.2

Comment on the question

The way the question is worded, "A" can be any value less than 68.1, down to -∞. The question does does not require the A-B range to be symmetrical.

its the second choice.

step-by-step explanation:

the elements in the range will be 7 less than the elements in the domain.