Question

Asked Mar 8, 2019

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Find the proportion of scores greater than 70 mean is 90 standard deviation is 10

Step 1

**The standard normal distribution:**

A continuous random variable *Z* is said to follow standard normal distribution if the probability density function of *Z* is,

Step 2

**Z-score:**

The *Z*-score measures a particular value’s relationship to the mean in a group of values. It gives the number of standard deviation from the mean for the particular data point.

The general formula to obtain *Z-*score is,

*Z =* (*x – *population mean) / population standard deviation.

Step 3

Here, the score, say *X*, has mean 90 and standard deviation 10. Thus, the p...

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