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3 years ago

Whats the first step here

Mathematics

1 answer:

jeka57 [31]3 years ago

5 0

B. Multiply the top equation by 3
-2y will turn into -6y and the y's will cancel out

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One sample has Aa Aa One sample has n 10 scores and a variance of s2 20, and a second sample has n 15 scores and a variance of s

siniylev [52]

Answer:

option (a) It will be closer to 30 than to 20

Step-by-step explanation:

Data provided in the question:

For sample 1:

n₁ = 10

variance, s₁² = 20

For sample 2:

n₂ = 15

variance, s₂² = 30

Now,

The pooled variance is calculated using the formula,

$S^{2}_{p} = \frac{(n_{1}-1)\times s^{2}_{1} +(n_{2}-1)\times s^{2}_{2}}{n_{1}+n_{2}-2}$

on substituting the given respective values, we get

$S^{2}_{p} = \frac{(10-1)\times 20 +(15-1)\times 30}{10+15-2}$

$S^{2}_{p}$ = 26.0869

Hence,

the pooled variance will be closer to 30 than to 20

Therefore,

The correct answer is option (a) It will be closer to 30 than to 20

4 0

3 years ago

Write as a mixed number 5.06

sleet_krkn [62]

Answer:

5 $\frac{3}{50}$

Step-by-step explanation:

0.06 = 6/100 = 3/50

3 0

3 years ago

Read 2 more answers

The speed of light is 186,182 miles per second. How many miles can light travel in a non-leap year? Express your answer in scien

zepelin [54]

So theres 366 days in a leap year,
you need to find hours, minutes, and then seconds
366 x 24 = 8,784 hours
8,784 x 60 = 527,040 minutes
527,040 x 60 = 31,622,400 seconds
31,622,400 seconds x 186,182 mps = 5.88 x 10^10
therefore light travels 5.88 x 10^10 in one leap year

7 0

3 years ago

What is 0.12 in words

Mama L [17]

Answer:

Zero point twelve. Or, Twelve Hundredths.

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Find<br>the<br>value<br>of sin 90+ tan45?<br>

sashaice [31]