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2 years ago

Sandra plans to swim a total of 2 5% miles

Mathematics

1 answer:

SSSSS [86.1K]2 years ago

7 0

For 2 5% Do you mean 2 5/6? If It is then here your answer..

If Not Please tell me..

Answer:

6 1/14

Step-by-step explanation:

2 5/6 · 2 1/7

= 17/6 · 15/7

= 85/14

= 6 1/14 miles

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In order to estimate the difference between the average hourly wages of employees of two branches of a department store, two ind

liberstina [14]

Answer:

Step-by-step explanation:

Hello!

You have two populations of interest and want to compare them. If you define the study variables as:

X₁: average hourly wages of an employee of the Downtown store.

n₁= 25

X[bar]₁= $9

S₁= $2

X₂: average hourly wages of an employee of the North Mall store.

n₂= 20

X[bar]₂= $8

S₂= $1

Both samples taken are independent, assuming that both populations are normal and that their population variances are equal I'll use the Student's-t statistic with a pooled sample variance to calculate the Confidence interval:

95% CI for μ₁ - μ₂

(X[bar]₁-X[bar]₂) ± $t_{n_1+n_2-2; 1-\alpha /2} * (Sa*\sqrt{\frac{1}{n_1} +\frac{1}{n_2} } )$

$Sa^2= \frac{(n_1-1)S_1^2+(n_2-1)S_2^2}{n_1+n_2-2}$

$Sa^2= \frac{24*4+19*1}{25+20-2}= 2.67$

Sa= 1.64

$t_{n_1-n_2-2;1-\alpha /2} = t_{43; 0.975} = 2.017$

(9-8)±2.017* $(1.64*\sqrt{\frac{1}{25} +\frac{1}{20} } )$

[0.007636;1.9923]

I hope it helps!

6 0

3 years ago

Tuiton at a certain college recently increased from $4000 to $5000. Find the ratio of the increase in price to the original pric

koban [17]

The increase is $5000-$4000=$1000. The ratio of this increase to the original price is

$1000
-------- = 1/4 (no units of measurement here)
$4000

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3 years ago

A father is four times as old as his son. In 3 years, the father will be three times as old as his son. How old is each now?

matrenka [14]

4x+3=3(x+3)

4x+3=3x+9

4x-3x=9-3

x=6

So The Father is 24 and the Son is 6

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3 years ago

Please Help Me worth 20 points

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Answer:

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2.Yes,the sample is unbiased and equal to everyone.

3.200

Step-by-step explanation:

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3 years ago

Which equation describes the relationship between the variables in the table below?

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The answer would be D praise our lord zucc

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3 years ago

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