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nasty-shy [4]
2 years ago
12

A set of quiz scores is shown in the histogram below. The mean of the data set is 20.2, and the (population) standard deviation

is 2.4.
PLEASE PLEASE PLEASE How many numbers in the data set are within 1 standard deviation of the mean?

13
14
15
16

Mathematics
1 answer:
Neko [114]2 years ago
5 0

Answer:

13

Step-by-step explanation:

As the mean is 20.2 and the standard deviation is 2.4

The range within the first standard deviation is

(17.8,22.6)

This means that we can safely use the range of (18,22) as we cannot confirm whether the other values fall within the range.

Within this range there are

2+3+4+3+1=13

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70

Step-by-step explanation:

280×25%=70 pages per night

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Answer:

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Step-by-step explanation:

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2 years ago
Tisha orders a carpet for a room that measures 270 square feet. The salesman says the carpet costs $12.00 per square yard. He ex
Tomtit [17]

Answer:

What error did the salesman make?

The salesman made an error when convert 270 square feet to yards.

What should be the actual cost of the carpet?

The actual cost of the carpet is $360

Step-by-step explanation:

From the question, we are told that:Tisha orders a carpet for a room that measures 270 square feet.

This means the room needs 270 square feet of carpet

But from the question, we know that the carpet is sold in square yards

We convert square feet to square yards

For our conversion rates

3 ft = 1 yard

9 ft² = 1 square yards(yd²)

270 ft² = x

Cross Multiply

9 ft² × x = 270ft² × 1 yd²

x yd²= 270ft² × 1 yd²/9 ft²

x = 30 yd²

Hence, 270ft² = 30yd²

Cost of carpet =

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30 yd² =

Cross Multiply

= 30 × $12.00

= $360.00

The actual cost of the carpet is $360

What error did the salesman make?

The salesman made an error when convert 270 square feet to square yards.

He said 270 square feet = 90 square yards

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What should be the actual cost of the carpet?

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3 0
3 years ago
What does 5 + 3 1/8 =
mafiozo [28]
It equals 8 1/8 because 5 + 3 = 8 plus the 1/8
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MakcuM [25]

Answer:

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Step-by-step explanation:

Simplify: |3 – 10| – (12 / 4 + 2)^2

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2 years ago
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