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3 years ago

Kelly Union works as a cashier and earns $12.75 per hour. Kelly worked

Mathematics

1 answer:

Shkiper50 [21]3 years ago

4 0

Answer:

it's 300=8 hours per hour

Step-by-step explanation:

533=9=5=8 you have to jump two times till u get 8

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A recipe for cookies called for 2/3 of a cup of sugar per batch.Elena used 5 1/3 cups of sugar to make multiple batches of cooki

Nookie1986 [14]

Answer: 8 batches

explanation: 5 1/3 divided by 2/3 equals 8. To find out how many batches were made, you need to divide the total amount used by the amount needed for one batch.

5 0

3 years ago

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What is the mean and standard deviation of the random variable Y (the number of females out of 40 who are color blind)? Answers

Debora [2.8K]

The question is incomplete! Complete question along with answer and step by step explanation is provided below.

Question:

Colorblindness is any abnormality of the color vision system that causes a person to see colors differently than most people, or to have difficulty distinguishing among certain colors Colorblindness is gender-based, while the majority of sufferers being males.

Roughly 8% of white males have some form of colorblindness, while the incidence among white females is only 1%. A random sample of 20 white males and 40 white females was chosen.

Let X be the number of males (out of the 20) who are colorblind.

Let Y be the number of females (out of the 40) who are colorblind.

What is the mean and standard deviation of the random variable Y (the number of females out of 40 who are color blind)? Answers may be rounded.

Given Information:

Female colorblindness proportion = 1%

Male colorblindness proportion = 8%

Female sample size = 40

Male sample size = 20

Required Information:

Mean = μ = ?

Standard deviation = σ = ?

Answer:

Mean = μ = 0.40

Standard deviation = σ = 0.015

Step-by-step explanation:

Let us check if the condition np ≥ 10 is satisfied or not

40*0.01

0.4 < 10

Since the condition np ≥ 10 is not satisfied the binomial random variable cannot be well approximated by a normal random variable. A larger sample size would be required to satisfy the condition np ≥ 10.

The mean is

μ = np

μ = 40*0.01 = 0.40

The standard deviation is

σ = √p(1 - p)/n

σ = √0.01(1 - 0.01)/40

σ = 0.015

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3 years ago

Read 2 more answers

PLEASE I NEED HELP

klemol [59]