Question 875267: Number of customer in the store during a day follows Normal distribution
with mean M and standard deviation σ.
Find probability that number of customer during a day will be:
1. less than x1 P(x < x1)
2. greater than x2 P(x > x2)
3. between x1 and x2 P(x1 < x < x2)
For M, σ, x1, x2 use numbers in the table
Help: convert x1 and x2 to z1, z2 using formula: z = (x - M)/σ
and use Appendix tables for Normal distribution.
M...... σ..... x1...... x2
70..... 10...... 65...... 88
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! M = 70, SD = σ = 10 , z = (x - M)/σ
1. P(x < 65)= P(z < -.5) = .3085
2. P(x > 88) = P(z > 1.8) = .0359
3. P(65 < x < 88) = P(z <1.8) - P(z < -.5) = .9641 - .3085
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