In: Statistics and Probability
Let X denote the amount of space occupied by an article placed in a 1-ft3 packing container. The pdf of X is below.
f(x) =
56x6(1 − x) | 0 < x < 1 | |
0 | otherwise |
(a) Graph the pdf.
Obtain the cdf of X.
F(x) =
|
|
Graph the cdf of X.
(b) What is P(X ≤ 0.65) [i.e., F(0.65)]?
(Round your answer to four decimal places.)
(c) Using the cdf from (a), what is P(0.25 < X
≤ 0.65)? (Round your answer to four decimal places.)
What is P(0.25 ≤ X ≤ 0.65)? (Round your answer to
four decimal places.)
(d) What is the 75th percentile of the distribution? (Round your
answer to four decimal places.)
(e) Compute E(X) and
σX. (Round your answers to four
decimal places.)
E(X) | = |
σX | = |
(f) What is the probability that X is more than 1 standard
deviation from its mean value? (Round your answer to four decimal
places.)