ndow Help Do Homework Bonnie Clark aspx?homeworkld 420598076&questionld-; 18flus

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ndow Help Do Homework Bonnie Clark aspx?homeworkld 420598076&questionld-; 18flushed false&cld; 4274775& centerwinsyes https://www.mathxl.com/Student/PlayerHomework. 3/1/17 11:37 AM Spring 2017 STAT 211-016 (TR 1PM 1:50 PM) Bonnie Clark & Homework: HW #6: Chapter 14-15.1 Score: 0 of 2 pts 4 2 of 7 (2 complete) v HW Score: 20%, 2 of 10 X 5.5.84-T E Question Help The proportion of households in a region that do some or all of their banking on the Internet is 0.27.In a random sample of 1000 households from this region, let x be the number that do some or all of their banking on the Internet. a. Find the mean of x, b, Find the standard deviation of x c. Find the z-score for the value x 179.5. d. Find the approximate probability that the number of households that use the Intermet for banking in a sample of 1000 is ess than or equal to 179.

Explanation / Answer

Answers to the problem:

p = .27

n=1000

a. Mean = np = .27*1000 = 270

b. Stdev = sqrt(npq) = sqrt(.27*.73*1000) = 14.039

c. Z score = ?

Z = (179.5-279)/(14.039) = -7

d. P(X<179) = ? For Z <-7 we have p value of almost 0

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