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)

describing distributions is one of the key skills you’ll need to earn a high score on the ap statistics exam. if you need proof of this, just flip through some past exam questions, which can be found at the collegeboard website. you’ll notice that the first free response question is almost always a question requiring you to look at a graph and describe it.

step-by-step explanation: just trying to get points sorry : (