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chubhunter [2.5K]

3 years ago

11

Suppose there are 20 questions on a multiple choice test.if 25%of the answers are choice B how many of the answers are not choic

e B

2 answers:

hammer [34]3 years ago

7 0

First, break down the question. There are 20 questions in all. So, do 20-25%=15. So, 15 questions aren't choice B.

ahrayia [7]3 years ago

5 0

The amount of answers that are not choice B are 15 questions.

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What is the answer to - 1/3 (x+6)=0

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3 years ago

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If I had a large square with 12 small squares shaded what percentage of the square is shaded

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3 years ago

Please help find the probability that x >25.

bija089 [108]

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2 years ago

A motorboat takes 5 hours to travel 200 miles going upstream. The return trip takes 4 hours going downstream. What is the rate o

dsp73

Answer:

rate of motorboat: b

rate of current: c

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d = rt

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3 years ago

A poll conducted in 2013 found that 55% of U.S. adult Twitter users get at least some news on Twitter (Pew, 2013). The standard

alina1380 [7]

Answer:

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Step-by-step explanation:

Confidence interval:

A confidence interval has the following format:

$M \pm zs$

In which M is the sample mean, z is related to the confidence level and s is the standard error.

55% of U.S. adult Twitter users get at least some news on Twitter (Pew, 2013). The standard error for this estimate was 2.2%.

This means that $M = 55, s = 2.2$

99% confidence level

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Lower bound of the interval:

$M - zs = 55 - 2.575*2.2 = 49.34$

Upper bound:

$M + zs = 55 + 2.575*2.2 = 60.66$

The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is between 49.34% and 60.66%, which means that we are 99% sure that the true percentage of US adult Twitter users who get some news is in this interval.

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2 years ago