Hi

Note: The probability of x successes in n trials is: 

P = nCx*  where p and q are the probabilities of success and failure respectively. 

In this case p = .25 and q = .75  and n = 7

nCx = 

P( sample contains 4 minorities) = 35(.25)^4(.75)^3

P(sample < than 2 minorities)= P(0)+P(1) =  (.75)^7 + 7(.25)(.75)^6

P(sample contains exactly 1 non-minority) = 7(.25)(.75)^6



expected value of minorities in the sample = .25*7 = 1.75 

RELATED QUESTIONS

Twenty-five percent of the employees of a large company are minorities. A random sample... (answered by Boreal)

twenty percent of the employees of a large company are female. find the probability that... (answered by stanbon)

Twenty percent of the employees of a large company are female. Use the normal... (answered by math_tutor2020,ikleyn)

According to a survey, 38% of employees working at a very large company are happy with... (answered by ikleyn)

A large marketing firm will select 4 employees from a list of 8 to represent the company... (answered by stanbon,Maths68)

I was owndering if I got these two questions right for my worksheet?

Correctly... (answered by stanbon)

Twenty percent of the employees of a large company are female.use the normal... (answered by stanbon)

The hourly wage for employees at a large company is $18.50. The standard deviation is... (answered by ewatrrr)

in a certain college 33% of the physics major are ethnic minorities. a random sample of... (answered by jim_thompson5910)