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natulia [17]
3 years ago
15

There are 22 students in Bella’s class. The class is voting for 2 students to represent them on a committee. What is the probabi

lity Bella’s two choices will be picked? (Assume the vote is random.)
Mathematics
2 answers:
Snowcat [4.5K]3 years ago
8 0

Answer:

1/20 or 2/40

Step-by-step explanation:

I solved it :)

Tju [1.3M]3 years ago
6 0

Answer:

well wouldnt there be a 50/50 chance her choice will be picked since there are only 2 im sorry if im wrong

Step-by-step explanation:

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25.12 is the Circumference Area is 50.24

Step-by-step explanation:

Area is cm2 Circumference is cm

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lawyer [7]

Answer:

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Step-by-step explanation:

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3 years ago
The brand manager for a brand toothpaste must plan a campaign designed to increase brand recognition. He wants to first determin
bulgar [2K]

We need to find out how many adults must the brand manager survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage.

From the given data we know that our confidence level is 90%. From Standard Normal Table we know that the critical level at 90% confidence level is 1.645. In other words, Z_{Critical}=1.645.

We also know that E=5% or E=0.05

Also, since, \hat{p} is not given, we will assume that \hat{p}=0.5. This is because, the formula that we use will have \hat{p}(1-\hat{p}) in the expression and that will be maximum only when \hat{p}=0.5. (For any other value of \hat{p}, we will get a value less than 0.25. For example if, \hat{p} is 0.4, then 1-\hat{p}=0.6 and thus, \hat{p}(1-\hat{p})=0.24.).

We will now use the formula

n=(\frac{Z_{Critical}}{E})^2\hat{p}(1-\hat{p})

We will now substitute all the data that we have and we will get

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Answer:

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Step-by-step explanation:

To find the answer to this question, we need divide 60 by 25 to find out how much to multiply 2 by so its equal.

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Hope this helps!

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