Monday

November 24, 2014

November 24, 2014

Posted by **JOSH** on Saturday, October 3, 2009 at 3:44pm.

- Statistics -
**jim**, Saturday, October 3, 2009 at 5:06pmSince the flight is always fully booked, we can say that the luggage weight's mean is 8000 and the SD is 2000.

We're interested in the number of flights that is more than (300 / 2000 =) .15 SD above the mean.

Now we go to a z-score table - Google will provide, if you don' have one handy - and look up the value. The one I found says that 0.5596 of flights will be below the +0.15 SD mark, so that leaves .4404, or 44%, above it.

- Statistics -
**economyst**, Monday, October 5, 2009 at 6:47pmI dont think jim is correct.

The SD of X+Y = sqrt[var(X)+var(Y)+2cov(XY) ]

Assuming all air-travelers are independent of each other, the last term goes away. Var(X)=SD(X)^2 = 400

so SD = sqrt(100*400) = 200

take it from here.

**Answer this Question**

**Related Questions**

statistics - From past experience, an airline has found the luggage weight for ...

Statistics - From past experience, an airline has found the luggage weight for ...

Business Statistics - From past experience, an airline has found the luggage ...

stat - The ministry of transport and communication is responsible for the ...

statistics - you have a box of 12 widgets whose average weight for each ...

statistics - You have a box of 15 widgets whose average weight for each ...

statistics - In response to the increasing weight of airline passengers, the ...

STAT - The weights of the 100 students in an introductory statistics class are ...

Statisitics:Standard Deviation of Population and o - Standard Deviation of ...

STAT - The weights of the 100 students in an introductory statistics class are ...