3 years ago

Which type of survey does this example represent?

Mathematics

1 answer:

Ksenya-84 [330]3 years ago

8 0

It is d my good sir

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Last year, a person wrote 126 checks. Let the random variable x represent the number of checks he wrote in one day, and assume

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Answer: The mean number of checks written per day $=0.3452$

Standard deviation $=0.5875$

Variance $=0.3452$

Step-by-step explanation:

Given : The total number of checks wrote by person in a year = 126

Assume that the year is not a leap year.

Then 1 year = 365 days

Let the random variable x represent the number of checks he wrote in one day.

Then , the mean number of checks wrote by person each days id=s given by :-

$\lambda=\dfrac{126}{365}\approx0.3452$

Since , the distribution is Poisson distribution , then the variance must equal to the mean value i.e. $\sigma^2=\lambda=0.3452$

Standard deviation : $\sigma=\sqrt{0.3452}=0.5875372328\approx0.5875$

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Answer:

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A board is 85cm in length and must be cut so that one piece is 11cm longer than the other piece . Find the length of each piece.

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The shorter piece is 37 cm

The longer piece is 48 cm:

Step-by-step explanation:

Divide 85 cm by 2 = 42.5

Divide 11 cm by 2 = 5.5

Add them together = 48 cm

85 cm - 48 cm = 37 cm

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Step-by-step explanation:

120 is 3 boxes of pencils

120 is 8 boxes of pens

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