2 years ago

Simplify 9^{2} / 9^{7}

Mathematics

1 answer:

monitta2 years ago

8 0

It is 2/18 I hope I can help

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A person gets on and off a bathroom scale four times. The four readings (in pounds) are 148, 151, 150, and 152. Each time after

Ganezh [65]

Answer:

See explanation below

Step-by-step explanation:

Since each time after the person gets off the scale, the reading is 2 lb the person's weight must be near the mean of

148-2, 151-2, 150-2, 152-2; that is to say, near the mean of 146, 149, 148, 150 = (146+149+148+150)/4 = 148.25

We could estimate the uncertainty as the standard error SE

$\bf SE=\frac{s}{\sqrt{n}}$

where

s = standard deviation of the sample

n = 4 sample size.

Computing s:

$\bf s=\sqrt{\frac{(146-148.25)^2+(149-148.25)^2+(148-148.25)^2+(150-148.25)^2}{4}}=1.479$

So, the uncertainty is 1.479/2 = 0.736

It is not possible to estimate the bias, since it is the difference between the true weight and the mean, but we do not know the true weight.

5 0

2 years ago

PLEASE HELP ASAP <333 What is the sum of the geometric series ?

ankoles [38]

Answer:

Step-by-step explanation:

There are a couple of ways to do this. You could figure all four terms out and add them, which is likely the simplest way.

One: 6^(1 - 1) = 6^0 = 1

Two: 6^(2 - 1) = 6^1 = 6

Three: 6^(3 - 1) = 6^2 = 36

Four: 6^(4 - 1) = 6^3 = 216

Sum = 259

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3 years ago

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Lorico [155]

Answer:

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2 years ago