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Suppose systolic blood pressure of 18-year-old females is approximately normally distributed with a mean of 119...

Suppose systolic blood pressure of 18-year-old females is approximately normally distributed with a mean of 119 mmHg and a variance of 619.51 mmHg. If a random sample of 21 girls were selected from the population, find the following probabilities:

a) The mean systolic blood pressure will be below 116 mmHg.
probability =

b) The mean systolic blood pressure will be above 120 mmHg.
probability =

c) The mean systolic blood pressure will be between 107 and 119 mmHg.
probability =

d) The mean systolic blood pressure will be between 104 and 115 mmHg.
probability =

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