Computing proportions in normal distribution

Reference no: EM1391782

Assume we have a population of scores with a mean of 975 and a standard deviation of 15. Assume that the distribution is normal. Provide answers to the following questions:

What percentage of the population will lie between 960 and 990?

What percentage of the population will lie below 975?

What percentage of the population will lie below 990?

What two values of X (the counts) would encompass the middle 50 percent of scores?

Reference no: EM1391782

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