Asked by Anonymous
A mail order company has 8% success rate. If it mails advertisements to 600 people, find the probability of getting less than 40 sales.
Answers
Answered by
MathGuru
Find mean and standard deviation.
mean = np = 600 * .08 = ?
standard deviation = √npq = √(600)(.08)(.92) = ?
Note: q = 1 - p
I'll let you finish the calculations.
Once you have the mean and standard deviation, then use z-scores:
z = (x - mean)/sd
x = 40
Once you calculate the z-score, use the z-table to find your probability. (Remember that the question is asking for the probability of "getting less than 40" sales.)
I hope this will help get you started.
mean = np = 600 * .08 = ?
standard deviation = √npq = √(600)(.08)(.92) = ?
Note: q = 1 - p
I'll let you finish the calculations.
Once you have the mean and standard deviation, then use z-scores:
z = (x - mean)/sd
x = 40
Once you calculate the z-score, use the z-table to find your probability. (Remember that the question is asking for the probability of "getting less than 40" sales.)
I hope this will help get you started.
Answered by
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.1075
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