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san4es73 [151]
4 years ago
12

The GMAC Insurance company reported that the mean score on the National Drivers Test was 69.9 with a standard deviation of 3.7 p

oints. 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.
Mathematics
1 answer:
kkurt [141]4 years ago
7 0

Answer:

  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

_____

<em>Comment on the question</em>

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.

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