Mathematics, 20.09.2020 05:01 shelbyp2003

One sample has a mean of M=7.2 and a second sample has a mean of M=12.8. The two sample are combined into a single set of scores. a. What is the mean for the combined set if both the samples have n=5? b. What is the mean for the combined set if the first sample has n=5 and the second sample had n=35?

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Answer from: jay555538

a. M = 50

b. M = 242

Step-by-step explanation:

mean = $\frac{sum of scores}{number of samples}$

⇒ sum of scores = mean x number of samples

Let the mean be represented by M, and the number of samples be represented by n,

sum of scores = M x n

a. When n = 5 for both samples,

The first sample's sum of scores = M x n

= 7.2 x 5

= 36

The second sample's sum of scores = M x n

= 12.8 x 5

= 64

The mean for the sum of scores of the combined set = $\frac{36 + 64}{2}$

= 50

When both samples have n = 5, the mean of the combined set is 50.

b. When the first sample has n = 5, the sum of scores = 36.

If n = 35 for the second sample, the sum of scores = M x n

= 12.8 x 35

= 448

The mean for the sum of scores of the combined set = $\frac{36 + 448}{2}$

= 242

Answer from: Quest

answer is d-29

step-by-step explanation:

since you didn't include the picture, i can give you the description so you know how to pick the correct answer. the third quartile of a data is always shown in a box plot. in the middle of your graph should be a box. the third quartile is the value that goes with the far right edge of the box.

Answer from: Quest

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

step-by-step explanation:

given that triangle lno is congruent to triangle lnm.

we have to fill up the blanks in the given question.

according to above order of congruency kept in mind we can say that

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

ln ≅ ln due to common in both.

hence, by sas congruency,

the side angle side rule states that if two sides and the included angle of one triangle are congruent to another triangle, then these two triangles are congruent.

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One sample has a mean of M=7.2 and a second sample has a mean of M=12.8. The two sample are combined...

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