1. (5 points) Let X be a continuous random variable with PDF
0.3 0 < x < 1
f (x) =
1 VI x < 2
(a) Find the median of X.
(b) Find the expected value of X.
4. (5 points) The manager of a healthy food store has determined that the weekly demand for a
popular type of granola is a normally distributed random variable with mean 85 pounds and
standard deviation 5 pounds. If the demand for a given week falls within the lowest 2.5%
of all possible values for the weekly demand, the price of the granola will
following week. Calculate the value in pounds (lbs) for the weekly demand below which the
manager will have to reduce the price. (Use R and give code)
6. (5 points) Let X be a standard normal random variable. Let Y = X2. Find the 0.9-quantile
of Y. (Use R and give code.)
You are not expected to and don't need to figure out the distribution of Y.
the quantile of Y to a quantile of X.
.x² < 4
x < 2
2 < x < 2
x2 > 4
x > 2
x > 2 or x < - 2
1 < x2 < 4
1 < x <
1 < x < 2 or - 2 < x < - 1
Use R to find the final results
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