3 years ago

Khan academy hellpp pleaseee

Mathematics

1 answer:

wolverine [178]3 years ago

3 0

Answer: the answer is 28

Step-by-step explanation:

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A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99% level

cupoosta [38]

Answer:

The sample required is $n = 135$

Step-by-step explanation:

From the question we are told that

The standard deviation is $\sigma = 9$

The margin of error is $E = 2$

Given that the confidence level is 99% then the level of significance is mathematically evaluated as

$\alpha = 100-99$

$\alpha = 1 \%$

$\alpha = 0.01$

Next we will obtain the critical value $\frac{\alpha }{2}$ from the normal distribution table(reference math dot armstrong dot edu) , the value is

$Z_{\frac{\alpha }{2} } = Z_{\frac{0.05 }{2} } = 2.58$

The sample size is mathematically represented as

$n = [ \frac{Z_{\frac{\alpha }{2} } * \sigma }{E} ]^2$

substituting values

$n = [ \frac{ 2.58 * 9 }{2} ]^2$

$n = 135$

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3 years ago

What’s the answer? And why

lbvjy [14]

B; if P equals one they would ha. have to divided it by 10 so do that to 4.3 and you would get 0.43

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3 years ago

Henry's house weighs 65,000 pounds. He removes all of his belongings which weigh 5,000 pounds. Movers are using Crib Jacks to li

adell [148]

Since 1 ton is 2,000 lbs, each Crib Jack can life 30,000 lbs. It's going to take 2 Crib Jacks, because the extra 5,000 lbs in belongings were removed, leaving the house at a weight of 60,000 lbs.

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3 years ago

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Jessica is asked to write a quadratic equation to represent a function that goes through the point (8, –11) and has a vertex at

Kitty [74]

Answer: c

Step-by-step explanation:

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3 years ago

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Write 800 as the product of its prime factors.

Alex_Xolod [135]

800|2
800|2
400|2
200|2
100|2
50|2
25|5
5|5
1

$800=2^5\cdot5^2$

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3 years ago