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Calculation of probability using z score

The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation of 6. Find the percentage of students that scored above 70.
15.9
50.0
84.1
23.1

Find the standard deviation of the given probability distribution.

x P(x)
0 0.24
1 0.01
2 0.12
3 0.16
4 0.01
5 0.14
6 0.11
7 0.21

2.62
4.45
6.86
2.25

Solution Summary

The solution gives step by step procedure for the calculation of probability from normal distribution. Calculation standard deviation is also discussed here.

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