According to the Bureau of Naval (sic) Standards , 75% of all people are inners (that is, their bellybuttons poke inward): everyone else is an outer....

According to the Bureau of Naval (sic) Standards , 75% of all people are inners (that is, their bellybuttons poke inward): everyone else is an outer. Let the random variable x be the number of outers among 7 randomly selected persons.  

A) Find the mean and variance of x. 

B)Find the probability that exactly 2 of the 7 person are outers.

C)Find the probability that no more than 6 of the 7 are outers. 

D)Find the probability that none of the 7 is an outer.

I would like for you to show your work and all the steps you took in solving this problem.

Thank you

According to the Bureau of Navel (sic) Standards, 75 percent of allpeople are “inners,” (that is, their belly buttons poke inward) ; everyoneelse is an “outer.” Let the random variable x...