Samples of size n = 20 are randomly selected from 4 different bins of dvds ranging in price from $4.99 to $9.99. you return each dvd before randomly drawing another and calculate the variance of each sample. what is the distribution of the sample variance?
a. normal distribution skewed to the right
b. normal distribution
c. not a normal distribution
d. normal distribution skewed to the left

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!

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