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3 years ago

11

If 6 men build a wall in 15 days, then how many days will 9 men take?

1 answer:

Lisa [10]3 years ago

5 0

If 6 men build a wall in 15 days then
1 man would build a wall in 2.5 days (found by dividing 15 by 6)
To find in how many day 9 will, we multiply 2.5 times 9
2.5*9= 22.5

ANSWER:
It will take 22.5 days

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Given

The data for 25 undergraduates

Solving (a): Range and Standard deviation

The range is:

$Range = Highest - Least$

From the dataset:

$Highest = 772$

$Least = 687$

So:

$Range = Highest - Least$

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So, the standard deviation is:

$\sigma = \sqrt{\frac{(769-724.2)^2 +(691-724.2)^2 +(699-724.2)^2 +(730-724.2)^2 +............+(715-724.2)^2}{25}}$

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$Interval = [\bar x - 2*\sigma, \bar x+ 2*\sigma]$

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