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Montano1993 [528]
2 years ago
8

Last year, the school's electric bill

Mathematics
1 answer:
lana [24]2 years ago
3 0

Answer:

AINT NOBODY CARES ABOUT SCHOOL

but the amount they spent each month was 145$

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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}

or

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

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2 years ago
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Galina-37 [17]

Answer:

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5 0
3 years ago
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What is 49 divideed by 21
anygoal [31]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
What is the answer of this question?​
polet [3.4K]

Answer:

116

Step-by-step explanation:

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7 0
3 years ago
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