SOLUTION: A mail order company has a 6% success rate. If it mails advertisements to 570 people, find the probability of getting less than 28 sales. Round z value calculations to 2 decimal pl
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-> SOLUTION: A mail order company has a 6% success rate. If it mails advertisements to 570 people, find the probability of getting less than 28 sales. Round z value calculations to 2 decimal pl
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Question 1081883: A mail order company has a 6% success rate. If it mails advertisements to 570 people, find the probability of getting less than 28 sales. Round z value calculations to 2 decimal places and final answer to 4 decimal places.
P (X < 28) Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! Normal approximation
mean is np=34.2
variance is np(1-p)=34.2*.94=32.148
sd is sqrt (V)=5.67
for x <28, using 27.5
z<(27.5-34.2)/5.67
z<-6.7/5.67=-1.18
That probability is 0.1190.
