A leading magazine (like Barron's) reported at one time that the
average number of weeks an individual is unemployed is 33 weeks.
Assume that for the population of all unemployed individuals the
population mean length of unemployment is 33 weeks and that the
population standard deviation is 2.3 weeks. Suppose you would like
to select a random sample of 69 unemployed individuals for a
follow-up study.
Find the probability that a single randomly selected value is
greater than 33.
P(X > 33) = (Enter your answers as numbers
accurate to 4 decimal places.)
Find the probability that a sample of size n=69 is randomly
selected with a mean greater than 33.
P(M > 33) =
Solution :
Given that ,
mean = = 33
standard deviation = =2.3
P(x >33 ) = 1 - p( x<33 )
=1- p [(x - ) / < (33-33) /2.3 ]
=1- P(z <0 )
= 1 -0.5 = 0.5
probability =0.5000
n = 69
= = 33
= / n = 2.3/ 69 = 0.2769
P(M > 33) = 1 - P(M < )
= 1 - P[(M - ) / < (33-33) /0.2769 ]
= 1 - P(z <0 )
= 1-0.5 =0.5
Probability = 0.5000
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