Reference no: EM13122423
Probability: Variance, Mean and Standard Deviation
1) Suppose we have an aisle with storage racks on both sides of the aisle. The aisle is 100 feet long. A worker is stationed at one end of the aisle. The worker needs to retrieve an item from storage. Assume that the items are divided into two groups: high turnover and low turnover. The high turnover items are stored in the locations closest to the workers location. Assume that 10% of the items are designated as high turnover, and they are responsible for 90% of the retrievals. Let L be the distance that the worker needs to walk along the aisle to reach the retrieval location.
a) What would be a reasonable density function for L?
b) What is the average distance that the worker needs to walk to the retrieval location (including units)?
c) What is the variance of L (including units)?
d) What is the standard deviation of L (including units)?
2) In the previous problem, suppose the worker walks at 5 feet per second and takes 10 seconds to remove the item from the storage rack. Let T denote the total time, round trip travel including the time to remove the item from the storage rack.
a) Derive an equation for T in terms of L.
b) Compute the mean of T.
c) Compute the variance of T.
d) Determine the probability density function of T.
Formulas:
Var[X] = E[X^2] - (E[X])^2
Mean of X: E(X)= Integral of xf(x) dx
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