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assume that blood pressure reading are normally distributed with a mean of 115 and a standard...

assume that blood pressure reading are normally distributed with a mean of 115 and a standard deviation of 4.9. If 34 people are randomly selected find the probability that their mean blood pressure will be less than 117

Math   Statistics-And-Probability   
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Answer #1

Solution :

= / n = 4.9 / 34 = 0.8403

P( < 117) = P(( - ) / < (117 - 115) / 0.8403)

= P(z < 2.38)

= 0.9913

probability = 0.9913

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