Posted by **Bill** on Saturday, November 10, 2012 at 4:32pm.

Before 1918, wolves were shown as 55% male, 45% female. From 1918 to present they were shown as 70% male and 30% female. In a random sample of 12 wolves, what was the probability that 6 were male? What was the probibility that 6 or more were female? What was the probability fewer than 4 were female?

(b) Answer part A for period from 1918 to present

- Binomial Probability -
**Reiny**, Saturday, November 10, 2012 at 6:50pm
Prob(male) = .7

prob(female) = .3

a) prob(6 are male_

= C(12,6) (.7)^6 (.3)^6 = .07925

b) prob(6 or more are female)

= prob(6 F) + prob(7 F) + prob(8 F + .. prob(12 F_

=

C(12,6)(.3)^6 (.7)^6 + C(12,7) (.3)^7 (.7)^5 + ... + C(12,12) (.3)^12 (.7)^0

I will let you do the button pushing

prob(less than 4 are female)

= prob(3 F) + prob(2 F) + prob (1 F) + prob(0 F)

= C(12,3) (.3)^3 (.7)^9 + ... + C(12, 0) (.3)^0 (.7)^12

= .....

## Answer this Question

## Related Questions

- ethics - f you were a researcher in evolutionary psychology, which of the ...
- ethics - f you were a researcher in evolutionary psychology, which of the ...
- ethics - If you were a researcher in evolutionary psychology, which of the ...
- Biometrics - If these samples were drawn from a population with mean male weight...
- statistics - 1) One hundred clients of a registered tax agent fall into the ...
- Probability - thirty animals are to be used in a medical experiment on diet ...
- math - thirty animals are to be used in a medical experiment on diet deficiency...
- statistics - 4 Find: a. The z score for each male salary, based on only the male...
- statistics - Assuming that the population variances are equal for Male and ...
- math - 3.A poll was taken to determine the birthplace of a class of college ...