Thirty percent of a magazine's subscribers are female. A random ...

[Jramos095]

Thirty percent of a magazine's subscribers are female. A random sample of 50 subscribers is taken. Answer the following questions using Excel:
 a. What is the probability that the proportion of females from this sample is at most .25?
  b. What is the probability that the proportion of females from this sample is between .22 and .28?
  c. What is the probability that the proportion of females from this sample is within .03 of the population proportion?

Question 2

Given that z is a standard normal random variable, what is the value of z if the area to the right of z is .1401?
 a. 1.08
  b. .1401
  c. 2.16
  d. 1.08

[djpooyouma]

Answer to Question 1

a. .220
=NORM.DIST(0.25,0.3,0.0648,TRUE)
b. .270
=NORM.DIST(0.28,0.3,0.0648,TRUE)  NORM.DIST(0.22,0.3,0.0648,TRUE)
c. .357
=NORM.DIST(0.33,0.3,0.0648,TRUE)  NORM.DIST(0.27,0.3,0.0648,TRUE)

Answer to Question 2

a

[Jramos095]

Gracias!

[helenmarkerine]

TYSM