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The math test scores of 3600 students in a certain district are close to normal distribution.
Knowing the average score and standard deviation, the whole distribution is clear.

The cumulative probability of 90 is 0.8 1 excel formula = norm.dist (90 90,80, 1 1.5, 1).

The cumulative probability of 70 is 0. 19 excel formula = norm.dist (70 70,80, 1 1.5, 1).

0.8 1-0. 19=0.62

0.62*3600=2232

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