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Assume that blood pressure readings are normally distributed with a mean of 124 and a standard...

Assume that blood pressure readings are normally distributed with a mean of 124 and a standard deviation of 9.6. If 144 people are randomly​ selected, find the probability that their mean blood pressure will be less than 126. Round to four decimal places.

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Expert Solution

Solution :

Given that ,

mean = = 124

standard deviation = = 9.6

= / n = 9.6 / 144 = 0.8

P( < 126) = P(( - ) / < (126 - 124) / 0.8)   

P(z < 2.5)

= 0.9938

Probability = 0.9938

orchestra answered 2 years ago
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