Suppose the scores of students on an exam are normally distributed with a mean of 405 and a standard deviation of 69. then approximately 99.7% of the exam scores lie between the numbers and such that the mean is halfway between these two integers.

 198 and 612

Step-by-step explanation:

We are given that the scores are normally distributed.

The mean of the data is 405.

The standard deviation of this data is 69.

Empirical rule states that for a normally distributed data that

Thus, 99.7% of data will lie between that is it will lie in the range (198,612)

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