A-level Maths · Statistical distributions

Normal probabilities

Standardise and find P(X < a), P(X > a) or P(a < X < b) for a normal distribution, to 4 d.p.

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Question 1

The random variable X∼N(30,100)X \sim N(30, 100). Find P(X<18)P(X < 18). Give your answer to 4 decimal places.

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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