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with a mean of 12.5 minutes and a standard deviation of 3.5, considering 121 people are...

with a mean of 12.5 minutes and a standard deviation of 3.5, considering 121 people are selected, what is the probability that the mean is less than 14 minutes

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Answer #1

Given that ,

mean =   = 12.5

standard deviation = = 3.5

n = 121

= 12.5

=  / n = 3.5/ 121=0.32

P( < 14) = P[( - ) / < (14-12.5) /0.32 ]

= P(z <4.69 )

Using z table  

=1   

probability= 1

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