Solution :
Given that ,
mean = = 50
standard deviation = = 7
P(x > 40 ) = 1 - P(x < 40 )
= 1 - P[(x - ) / < ( 40 - 50 ) / 7 ]
= 1 - P(z < -1.43 )
Using z table,
= 1 - 0.0764
= 0.9236
Assume the random variable x is normally distributed with mean u50 and standard deviation a= 7....
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