I Question 5 Given the probability density function f(.'1:) : Next 3:11:1(5) the mean, the variance and the standard deviation. Expected value: ' Mean: ' Variance: ' Standard Deviation: ' E\" 0/2 pts over the interval [0.8, 4], find the expected value, I Question 4 v E 01' At a particular fast-food restaurant, food is often made in advance, and then it is placed under a heater until it is sold. The distribution function for the number of minutes that passes between when a cheeseburger is made and when it is sold is given by 2 2 - f(t):{mt If 03:314 0 otherwise Find the median number of minutes that a cheeseburger sits under the heater