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3 years ago

Use mental math to estimate the unknown number 4210 divided by 6

Mathematics

2 answers:

professor190 [17]3 years ago

8 0

6 times 7 42 plus 4210

RideAnS [48]3 years ago

6 0

6 divides into 42 producing a quotient of 7 and no remainder. All that's left is to divide 6 into 10. That produces 1 with a remainder of 4.

So you could say immediately that 4210 divided by 6 is approx. 71.

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Note that the left side is 36 times the average of the weights of the swans in the sample, i.e. the probability above is equivalent to

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Recall that if $X\sim\mathcal N(\mu,\sigma)$ , then the sampling distribution $\overline X=\displaystyle\sum_{i=1}^n\frac{X_i}n\sim\mathcal N\left(\mu,\dfrac\sigma{\sqrt n}\right)$ with $n$ being the size of the sample.

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and the probability is equivalent to

$\mathbb P\left(\overline X>\dfrac{1000}{36}\right)=\mathbb P\left(6\dfrac{\overline X-26}{7.2}>6\dfrac{\frac{1000}{36}-26}{7.2}\right)$
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oksano4ka [1.4K]

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Step-by-step explanation:

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