Standard deviation of the population

Worldwide it is understood that IQ scores follow a normal distribution. It is assumed that the middle 95% of the population has an IQ between 70 and 130 with a mean of 100. Use this information to determine the following:

A. What is the standard deviation of the population?

B. What IQ score corresponds to the 90th percentile?

C. What percentile corresponds to a score of 75

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Basic Statistics: Standard deviation of the population
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