Devry Math 221 Quiz Week 5 - Latest

DeVry MATH 221 Quiz Week 5 - Latest

IF You Want To Purcahse A+ Work then Click The Link Below For Instant Down Load

http://www.acehomework.net/wp-admin/post.php?post=3365&action=edit

IF You Face Any Problem Then E Mail Us At JOHNMATE1122@GMAIL.COM

MATH 221 Quiz Week 5 DeVry

1. Sixty percent of households say they would feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings. Find the probability that the number that say they would feel secure is (a) exactly five, (b) more than five, and (c) at most five.

2. Find the probability that the number that say they would feel secure is exactly five.

P(5) = 0.279 (Round to three decimal places as needed)

1. Find the probability that the number that say they would feel secure is more than five.

P(x>5) = 0.315 (Round to three decimal places as needed)

1. Find the probability that the number that say they would feel secure is at most five.

P(x≤5) = 0.685 (Round to three decimal places as needed)

Hint:

Let X be the number of households say they would feel secure if they had $50,000 in savings. Clearly X is binomial with n = 8 and p = 0.60. The probability mass function binomial variable is given by .The probability for different values of x are given below.

X P(X) P(=X)

0 0.00065536 0.00065536 0 0.99934464 1

1 0.00786432 0.00851968 0.00065536 0.99148032 0.99934464

2 0.04128768 0.04980736 0.00851968 0.95019264 0.99148032

3 0.12386304 0.1736704 0.04980736 0.8263296 0.95019264

4 0.2322432 0.4059136 0.1736704 0.5940864 0.8263296

5 0.279 0.685 0.4059136 0.315 0.5940864

6 0.20901888 0.89362432 0.68460544 0.10637568 0.31539456

7 0.08957952 0.98320384 0.89362432 0.01679616 0.10637568

8 0.01679616 1 0.98320384 0 0.01679616

(a) P (5) = = 0.279

(b) P (x > 5) = P (x = 6) + P (x = 7) + P (x = 8)

= 0.315

(c) P (x ≤ 5) = 1 – P (x > 5) = 1 – 0.315 = 0.685

2. Suppose 80% of kids who visit a doctor have a...