SOLUTION: A chemical supply company ships a certain solvent in 10−gallon drums. Let X represent the number of drums ordered by a randomly chosen customer. Assume X has the following pr
Algebra.Com
Question 1022893: A chemical supply company ships a certain solvent in 10−gallon drums. Let X represent the number of drums ordered by a randomly chosen customer. Assume X has the following probability mass function:
x 1 2 3 4 5
p(x) 0.36 0.19 0.17 0.06 0.22
Find the variance of the number of drums ordered.
The variance of number of drums ordered =
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
We make use of the formula .
To find , we find pmf of :
1 4 9 16 25
p() 0.36 0.19 0.17 0.06 0.22
which is identical to the pmf of X.
==>
Now E(X) = 0.36 + 2*0.19 + 3*0.17 + 4*0.06 + 5*0.22 = 2.59
==>
RELATED QUESTIONS
A chemical supply company ships a certain solvent in 10-gallon drums. Let X represent the (answered by Boreal)
A chemical supply company ships a certain solvent in 10-gallon drums. Let X represent the (answered by Fombitz)
in a small workshop, eight 5 gallon drums of oil are on hand. If 2 gallons are used each... (answered by ewatrrr)
5. A Petroleum Company fills steel drums with a lubricating oil. The mechanism that... (answered by stanbon)
An auto service center has ten fifty-five gallon drums of 90% ethylene glycol, a common... (answered by stanbon)
If seven drums can empyt a tank in 28minutes,how many minutes will it takes 8 drums to... (answered by josgarithmetic)
Micah paid $1,080 for a new set of drums that were marked 20% off. What was the original (answered by mananth)
Suppose a pipe can fill 4 drums in 2 hours. How many drums can it fill in 5... (answered by JulietG)
The volume of a 6 x 12-ft tank is 339.3 cu ft. It contains air at 200 psig and 85°F. How (answered by CPhill)