maths help....

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1 total messages Started by wong Sat, 10 Apr 1999 00:00

#72

Author: wong
Date: Sat, 10 Apr 1999 00:00

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hi,
can anyone here help me with this question?

600 rounds are fired from a gun at a horizontal target 50m long which
extends from 950m to 1000m in range from the gun. The trajectories of the
rounds all lie in the vertical plane through the gun & the target. It is
found that 27 rounds fall short of the target & 69 rounds fall beyond it.
Assuming that the range of rounds is normally distributed, find the mean &
standard deviation of the range.

Appreciate any help.

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