University students' blood pressure can be expected to follow a normal distribution with a mean of 85 mmHG and a standard deviation of 20 mmHG. If four college students are randomly selected, what is the probability that their mean blood pressure is lower than 90 mmHG?

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University students' blood pressure can be expected to follow a normal distribution with a mean of 85 mmHG and a standard deviation of 20 mmHG.

If four college students are randomly selected, what is the probability that their mean blood pressure is lower than 90 mmHG?

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