Question 1054808: The number of days between billing and payment of charge accounts at Groshen’s, a large department store, is approximately normally distributed with a mean of 18 days and standard deviation of 4 days.
a.What is the probability that a bill will be paid between 12 and 18 days?
b.What is the probability that a bill will be paid between 20 and 23 days?
c.What is the probability that a bill will be paid between 10 and 20 days?
d.What is the probability that a bill will take longer than 21 days to be paid?
e.What is the probability that a bill will take less than 16 days to be paid?
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! mean of 18 days and standard deviation of 4 days
TI syntax is normalcdf(smaller, larger, µ, σ).
a. P(12 ≤ x ≤ 18)= normalcdf(12,18,18,4)
b. P(20 ≤ x ≤ 23)= normalcdf(20,23,18,4)
c. P(10 ≤ x ≤ 20)= normalcdf(10,20,18,4)
d. P(x > 21) = normalcdf(21,9999,18,4) 9999 a placeholder
e. P(x < 16) = normalcdf(-9999,16,18,4) -9999 a placeholder
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