assume that blood pressure reading are normally distributed with a mean of 125 and a standard...
assume that blood pressure reading are normally distributed with a mean of 125 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 127. round to four decimal places.
Homework Answers
Solution :
Given that,
mean = 
= 125
standard deviation = 
= 6.4
n = 64
= 125
= /
n = 6.4 /
64=0.8
P(
<127 ) = P[(
-
) /
< (127-125) /0.8 ]
= P(z <2.5 )
Using z table
= 0.9938
probability= 0.9938
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