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3 years ago

Please Help ASAP I am so desperate

Mathematics

1 answer:

melisa1 [442]3 years ago

8 0

Answer:

Step-by-step explanation:

There are 20C4 = 4845 ways to take a sample of 4 from 20.

For choices A and C, the mean will be over-estimated if 3 of the 4 samples are of the higher value. There are (10C3)×10 = 1200 samples that will cause the mean to be over-estimated.

For choice D, every sample will correctly estimate the mean, so there are 0 samples that will cause the mean to be over-estimated.

For choice B, any sample that contains all 2s will over-estimate the mean. There are 19C4 = 3876 such samples.

Of the data sets listed, a sample of 4 from data set B is most likely to be one of the samples that will over-estimate the mean.

_____

nCk = n!/(k!(n-k)!)

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Answer:

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Step-by-step explanation:

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Alexandra [31]

Answer:

The coordinates of the point Q is (4, 1)

Step-by-step explanation:

The given parameters are;

The directed line segment extends from R(-2, 4), to S(18, -6)

The ratio in which the point Q partitions the directed line segment = 3:7

Therefore, the proportions of the R to Q = 3/(3 + 7) = 3/10 the length of RS

Which gives;

(-2 + (18-(-2))×3/10, 4 +(-6 -4)×3/10) which is (4, 1)

The coordinates of the point Q = (4, 1)

We check the length from R to S is given by the relation for length as follows

$l =\sqrt{\left (y_{2}-y_{1} \right )^{2}+\left (x_{2}-x_{1} \right )^{2}}$

Where;

R(-2, 4) = (x₁, y₁)

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3 years ago