du/d21/le/content/278790/viewContent/2470659/View 12. Of the customers entering

Question

du/d21/le/content/278790/viewContent/2470659/View 12. Of the customers entering a showroom for stereo equipment, only 30% make purchases If 40 customers enter the showroom tomorrow, find the approximate probability that at e sample proportion problem.) 13. Consider the following dataset: 15, 24, 24, 30, 31, 31, 38, 39, 45, 48, 48 and 50. a. When forming a normal probability plot, what is found on the Y-Axis? b. Determine the vertical plotting position for the 7th observation. c. What percent of the population is less than or equal to a value of 39? d. What is one way to determine if the population is normally distributed?

Explanation / Answer

Solution:

it is a binomial distribution with p=.3:

P(at least 15)=1-P(14 or less)

if you have a graphing calculator, P(14 or less) can be obtained by : 2nd: distr

binomcdf(40, .3, 14)= .80744

1-.80744=.19256

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