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3 years ago

9

Please help with my math problem

1 answer:

REY [17]3 years ago

6 0

Answer is B hope it helps

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A researcher obtained M = 27 for a sample of n = 36 scores selected from a population with µ = 30 and σ = 18. This sample mean c

dusya [7]

Answer:

True

Step-by-step explanation:

Given that:

M = 27, sample of n = 36 scores, µ = 30 and σ = 18.

The z score is used in statistics to determine by how many standard deviations the raw score is above or below the mean. If the z score is positive, the raw score is greater than the mean and if the z score is negative the raw score is less than the mean. The z score is given as:

$z=\frac{x-\mu}{\sigma}$

Given that M = 27, this means that x = 27. Therefore:

$z=\frac{x-\mu}{\sigma}\\\\for \ a\ sample\ size(n):z=\frac{x-\mu}{\sigma/\sqrt{n} }\\\\z=\frac{27-30}{18/\sqrt{36} } =\frac{-3}{3}=-1$

This sample mean corresponds to a z-score of z = –1.00.

7 0

3 years ago

Another fairly simple one, pretty much a free Brainliest and 30 points.

Alchen [17]

Answer:

Solution given:

$8\frac{7}{12}-3\frac{1}{3}=\frac{8*12+7}{12}-\frac{3*3+1}{3}$

= $\frac{103}{12}-\frac{10}{3}$

taking lcm

= $\frac{103-10*4}{12}=\frac{63}{12}=\frac{21}{4}=5\frac{1}{4}$

7 0

2 years ago

Read 2 more answers

3. You can ride your bike 1/5 of a mile per minute. If it takes you 3 1/3 minutes to get

Allushta [10]

Answer:

2/3

.......................

6 0

3 years ago

Is The boundary line for the inequality y < -7/3x - 3 is a solid line.

777dan777 [17]

Answer:

Step-by-step explanation:

No. Only if the inequality symbol < were replaced with =, ≤ or ≥, would the boundary line be a solid line.

3 0

2 years ago

Solve the following polynomial function. y=x^4−21x^2−100

Alexxandr [17]

Answer:

y= x⁴ -21x²-100

combine x's I think

x⁴= 1x? cuz if it's 1x⁴ that's 1x*1x*1x*1x = 1x

1x * -21x²

-21x * -21x = 441x

+1x = 442x

y= 442x -100

I'm not sure if I did that right

5 0

3 years ago