The head of research and development of the US Army must select one of the antitank weapons from the accompanying listing for procurement. The listed results indicate the distance away from the intended target that 100 tests rounds fell. Which system should the army select, and why?

Weapon mean standard deviation
A 22.4 15.9
B 18.7 36.5
c 24.6 19.7

-6 + 3 = 3 - 6

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step-by-step explanation:

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the answer is 489

step-by-step explanation:

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

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3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

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