Question

Assume that blood pressure readings are normally distributed with a mean of 122 and a standard deviation of 6.4. If 64 people are randomly selected, find the probability that their mean blood pressure will be less than 124

Answer #1

Solution :

Given that ,

mean = = 122

standard deviation = σ = 6.4

n = 64

= 122

= / n = 6.4 / 64=0.8

P( < 124) = P[( - ) / < (124-122) /0.8 ]

= P(z <2.5 )

Using z table

= 0.9938

probability= 0.9938

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