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3 years ago

What is the difference?

Mathematics

1 answer:

siniylev [52]3 years ago

6 0

I hope this helps you

-2.03+1.6

-0.43

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The annual sales of romance novels follow the normal distribution. However, the mean and the standard deviation are unknown. For

Fynjy0 [20]

Answer:

Mean(m) = 462,536

sd = 29,268.29

Step-by-step explanation:

Given the following:

P(sales > 470,000) = 40% = 0.4

P(sales > 500,000) = 10% = 0.1

Using the z - table, we can locate the corresponding P values

Z = 1 - p = 1 - 0.4 = 0.6; 1 - 0.1 = 0.9

Locating the closest value to 0.6 on the z table ;

(0.25 + 0.26) / 2 = 0.255

Locating the closest value to 0.9 on the z table ;

Z = 1.28

Recall;

z =( x - m) / sd

Where m = mean ; sd = standard deviation

First condition:

0.255 = (470,000 - m) / sd

0.255 × sd = (470,000 - m) - - - - - (1)

1.28 = (500,000 - m) / sd

1.28 × sd = (500,000 - m) - - - - (2)

We can solve for one of the unknowns y subtracting equation (1) FROM 2

1.28sd - 0.255sd = (500,000 - m) - (470000 - m)

1.025sd =500,000 - m - 470000 + m

1.025sd = 30,000

sd = 29,268.29

Substituting the value od SD into (1) or (2)

1.28 × 29,268.29 = 500000 - m

37463.41 = 50000 - m

m = 50000 - 37463.41

Mean(m) = 462,536

7 0

4 years ago

Which of the following is an arithmetic sequence

Ludmilka [50]

Answer:

A sequence that has a contant addition/subtraction to get to the next term

for example:

-3, 0, 3, 6, ...

to get to the next term, we'll need to add 3 each time

Step-by-step explanation:

3 0

3 years ago

A chicken soup recipe calls for

ziro4ka [17]

I have attached a screenshot with the complete question

Answer:
$2 \frac{1}{4}$ cups

Explanation:
We know that one quart is equivalent to four cups. To know the number of quarts equivalent to 9 cups, we will simply use cross multiplication as follows:
1 quart ...............> 4 cups
?? quarts ...........> 9 cups

Number of cups = (9*1) / 4 = 2.25 = $2 \frac{1}{4}$ cups

Hope this helps :)