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jok3333 [9.3K]
3 years ago
10

Lefties The author had difficulty finding the percentage of people who write with their left hand. If we want to estimate that p

ercentage based on survey results, how many people must we survey in order to be 99% confident that we are within two percentage points of the population percentage? Assume that we know nothing about the percentage of the population that writes with the left hand.
Mathematics
1 answer:
Zigmanuir [339]3 years ago
8 0
I am a lefty, and I know for a fact that 40% off the population write with there left
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Answer:

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Step-by-step explanation:

i multpliy 9x4=36

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A box of cereal states that there are 75 calories in a three fourths 3/4​-cup serving. What is the unit rate for calories per​ c
Dimas [21]

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Step-by-step explanation:

A box of cereal states that there are 75 calories in a three fourths 3/4​-cup serving.

a) What is the unit rate for calories per​ cup?

This is calculated as:

3/4 cup = 75 calories

1 cup = x

Cross Multiply

3/4x = 75 calories × 1

x = 75 calories /3/4 cup

x = 75 ÷ 3/4

x = 75 × 4/3

x = 100 calories per cup

The unit rate for calories per​ cup is 100 calories per cup

b) How many calories are there in 2 cups of the​ cereal?

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3/4 cup = 75 calories

2 cups = x

Cross Multiply

3/4x = 75× 2

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x = 150 × 4/3

x = 200 calories

There are 200 calories in 2 cups of cereal.

7 0
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