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sweet-ann [11.9K]

3 years ago

12

A clothing store donated a percent of every sale to charity. The total sales were $8850, so the store donated $531 what percent

of $8850 was donated to charity?

1 answer:

Pie3 years ago

4 0

Answer:

6%

Step-by-step explanation:

$\frac{531}{8850} *\frac{x}{100} \\531*100= 5310053100/8850= 6%$

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There are three executives in an office, ages 56, 57, and 58. If a 57-year-old executive enters the room, the

vova2212 [387]

Answer:

option (c) The mean age will stay the same but the variance will decrease

Step-by-step explanation:

Case I: For 3 executives of ages 56, 57 and 58

Number of executives, n = 3

Mean = $\frac{\textup{56 + 57 + 58 }}{\textup{3}}$

or

Mean = 57

Variance = $\frac{\sum{(Data - Mean)^2}}{\textup{n-1}}$

or

Variance = $\frac{(56 - 57)^2+(57-57)^2+(58-57)^2}{\textup{3-1}}$

or

Variance = $\frac{1+0+1}{\textup{2}}$

or

Variance = 1

For Case II: For 4 executives of ages 56, 57, 58 and 57

Number of executives, n = 4

Mean = $\frac{\textup{56 + 57 + 58 + 57 }}{\textup{4}}$

or

Mean = 57

Variance = $\frac{\sum{(Data - Mean)^2}}{\textup{n-1}}$

or

Variance = $\frac{(56 - 57)^2+(57-57)^2+(58-57)^2+(57-57)^2}{\textup{4-1}}$

or

Variance = $\frac{1+0+1+0}{\textup{3}}$

or

Variance = 0.67

Hence,

Mean will remain the same and the variance will decrease

Hence,

The correct answer is option (c) The mean age will stay the same but the variance will decrease

3 0

3 years ago

Kelly earns 15% more than her sister, and together they earn $999.75. How much does Kelly earn per week?

valina [46]

Answer:

534. 75

Step-by-step explanation:

let the income of kellys sister be x

kellys income=x+15% of x

=23x over 20

x+23x/20=999. 75

or, x=465

kellys income=23×465/20

=534. 75

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3 years ago

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lesya [120]

Answer:

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Step-by-step explanation:

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4 0

3 years ago

Evaluate x/y for x equals 3/10 and y equals 4/5

Over [174]

Answer:

x/y = 3/8

Step-by-step explanation:

y = 4/5 = 8/10, so ...

x/y = (3/10)/(8/10) = 3/8

_____

One way to divide fractions is to make them have the same denominator. Then their ratio is the ratio of their numerators.

8 0

4 years ago

Convert 3,200,000 to scientific notation

Crank

Answer:

Step-by-step explanation:

3.2x10^6

4 0

3 years ago

Read 2 more answers