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2 years ago

Which is the most efficient way to solve this equation?

Mathematics

1 answer:

Maru [420]2 years ago

7 0

Answer: isn't it 21 then?

Step-by-step explanation:

kinda bad at math haha

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A set of headphones takes 5 minutes to charge up to 3 hours play. What is the unit rate?

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Answer:

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Step-by-step explanation:

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2 years ago

Lisa has 100 dollars in A savings account. The interest rate is 5% per year and is not compounded. How much interest will she ea

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2 years ago

Read 2 more answers

WILL GIVE BRAINLIEST!!!!!

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It’s either A or B but I would choose B as the correct answer

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2 years ago

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2 years ago

A study by Allstate Insurance Co. finds that 82% of teenagers have used cell phones while driving (the Wall Street Journal, May

Strike441 [17]

The probability that the sample proportion is within ± 0.02 of the population proportion is 0.3328

<h3>How to determine the probability?</h3>

The given parameters are:

Sample size, n = 100
Population proportion, p = 82%

Start by calculating the mean:

$\mu = np$

$\mu = 100 * 82\%$

$\mu = 82$

Calculate the standard deviation:

$\sigma = \sqrt{\mu(1 - p)$

$\sigma = \sqrt{82 * (1 - 82\%)$

$\sigma = 3.84$

Within ± 0.02 of the population proportion are:

$x_{min} = 82 * (1 - 0.02) = 80.38$

$x_{max} = 82 * (1 + 0.02) = 83.64$

Calculate the z-scores at these points using:

$z = \frac{x - \mu}{\sigma}$

So, we have:

$z_1 = \frac{80.36 - 82}{3.84} = -0.43$

$z_2 = \frac{83.64 - 82}{3.84} = 0.43$

The probability is then represented as:

P(x ± 0.02) = P(-0.43 < z < 0.43)

Using the z table of probabilities, we have:

P(x ± 0.02) = 0.3328

Hence, the probability that the sample proportion is within ± 0.02 of the population proportion is 0.3328