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Solve using R language The mean and SD of a certain group of 1000 high schoold grades, that are normally distributed are 78% and 11%

Solve using R language

The mean and SD of a certain group of 1000 high schoold grades, that are normally distributed are 78% and 11% respectively. (i) Find how many grades were above 90%? (ii) What was the highest grade of the lowest 10? (iii) What was the semi-interquartile range (Quartile deviation)? (iv) Within what limits did the middle 900 lie?

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