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3 years ago

Bad Investment After Mrs. Fisher lost 9% of her investment, she had $22,750. What was Mrs. Fisher's original investment?

Mathematics

1 answer:

stira [4]3 years ago

7 0

Answer:

$2500

Step-by-step explanation:

Given that,

The lost percentage = 9%

Amount she had = $22,750

We need to find Mrs. Fisher's original investment.

As she had lost 9%, it means she will remain with 91% of her investment. Let the original investment is x.

So,

$91\%\ of \ x=22,750\\\\\dfrac{91}{100}x=22,750\\\\x=\dfrac{22,750\times 100}{91}\\\\x=\$25000$

So, her original investment is equal to $25000.

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When we have a sample, the mean of the sample is used as the point estimate for the mean of the entire population.

What value will be used as the point estimate for the mean endowment of all private colleges in the United States?

We have to find the mean of the 8 colleges. So

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3 years ago

The reading speed of second grade students in a large city is approximately normal, with a mean of 90 words per

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Answer:

The probability that a random sample of 10 second grade students from the city results in a mean reading rate of more than 96 words per minute

P(x⁻>96) =0.0359

Step-by-step explanation:

Explanation:-

Given sample size 'n' =10

mean of the Population = 90 words per minute

standard deviation of the Population =10 wpm

we will use formula

$Z = \frac{x^{-}-mean }{\frac{S.D}{\sqrt{n} } }$

Let X⁻ = 96

$Z = \frac{96-90 }{\frac{10}{\sqrt{10} } }$

Z = 1.898

The probability that a random sample of 10 second grade students from the city results in a mean reading rate of more than 96 words per minute

$P(X^{-}>x^{-} ) = P(Z > z^{-} )$

= 1- P( Z ≤z⁻)

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= 0.5 - A(1.898)

= 0.5 -0.4641 (From Normal table)

= 0.0359

Final answer:-

The probability that a random sample of 10 second grade students from

= 0.0359

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3 years ago

Bad Investment After Mrs. Fisher lost 9% of her investment, she had $22,750. What was Mrs. Fisher's original investment?​

Bad Investment After Mrs. Fisher lost 9% of her investment, she had $22,750. What was Mrs. Fisher's original investment?