Question 925371: An electronics firm believes that 70% of the new products they market will be successful. if the company markets 80 products in the next 5 years, find the probability that in that time:
A) at least 60 products will be successful
B) at most 50 products will be successful.
C) between 55 and 59 products, inclusive, will be successful.
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! p(successful) = .70, n = 80
Re TY, You need a Calculator for cumulative Probabilities,,,YOurs or on-line
Can Recommend stattrek.com as an excellent reference
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Using a TI calculator 0r similarly a Casio fx-115 ES plus
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P(x ≥ 60) = 1 - binomcdf(80, .70, 59) = 1 - .8022
P(x ≤ 50) = binomcdf(80, .70, 50) = .0916
P( 55 ≤ x ≤ 59) = binomcdf(80, .70 59) - binomcdf(80, .70 54) = .8022-.3521
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