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Lilit [14]
2 years ago
12

A book sold 33,200 copies in its first month. Suppose this represents 7.4% of the number of copies sold to date. How many copies

have been sold to date?
Mathematics
2 answers:
coldgirl [10]2 years ago
7 0

Answer:

448,648

Step-by-step explanation:

33,200/.074 = 448,648

Marta_Voda [28]2 years ago
6 0

Answer: 448648

Step-by-step explanation:

33,200 copies represent 7.4% of the total amount

-----------------------------------------------------

#1  33,200 ÷ 7.4%

- this is because how we get 33,200 by calculation is use the total amount and times 7.4% to get 33,200. So we are just working backwards. Since it was times before, then we divide after.

 33,200÷7.4%

=33,200÷0.074

≈448648 (you can't round up when the real amount is less the exact amount)

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Answer:

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But we need to calculate the mean with the following formula:

\bar X = \frac{\sum_{i=1}^n X_I}{n}

And replacing we got:

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And thi is the best estimator for the population variance since is an unbiased estimator od the population variance \sigma^2

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Step-by-step explanation:

For this case we have the following data:

1.04,1.00,1.13,1.08,1.11

And in order to estimate the population variance we can use the sample variance formula:

s^2 = \frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}

But we need to calculate the mean with the following formula:

\bar X = \frac{\sum_{i=1}^n X_I}{n}

And replacing we got:

\bar X = \frac{ 1.04+1.00+1.13+1.08+1.11}{5}= 1.072

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