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2 years ago

H-E-L-P M-E please

Mathematics

1 answer:

Over [174]2 years ago

5 0

Answer:

Step-by-step explanation:

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A study indicates that 37% of students have laptops. You randomly sample 30 students. Find the mean and the standard deviation o

Brilliant_brown [7]

Answer:

The mean and the standard deviation of the number of students with laptops are 1.11 and 0.836 respectively.

Step-by-step explanation:

Let X = number of students who have laptops.

The probability of a student having a laptop is, P (X) = p = 0.37.

A random sample of n = 30 students is selected.

The event of a student having a laptop is independent of the other students.

The random variable X follows a Binomial distribution with parameters n and p.

The mean and standard deviation of a binomial random variable X are:

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

Compute the mean of the random variable X as follows:

$\mu=np=30\times0.37=1.11$

The mean of the random variable X is 1.11.

Compute the standard deviation of the random variable X as follows:

$\sigma=\sqrt{np(1-p)}=\sqrt{30\times0.37\times(1-0.37)}=\sqrt{0.6993}=0.836$

The standard deviation of the random variable X is 0.836.

5 0

3 years ago

A baker uses 3/4 cup of honey in one of his cakes. There are 60 calories in 1/8 cup of honey.

lutik1710 [3]

what is the question asking

6 0

3 years ago

Peter has a coupon for 15% off the price of any item in a sporting good store he wants to buy a pair of sneakers that are priced

aniked [119]

Answer:

$31.44

Step-by-step explanation:

According to the word problem, Peter has a coupon for 15% OFF.

This means the price will reduce by 15%.

To solve this, first, change the percentage (15%) to decimal form.

To do this, divide the percentage by 100.

15 / 100 = 0.15.

0.15 is the decimal form of 15%.

Next, multiply the decimal form of the percentage by the price.

36.99 x 0.15 = 5.5485

Lastly, subtract the product from the original price.

36.99 - 5.5485 = 31.4415

In this case, the product goes above the hundredths place.

So we must round 31.4415 to the hundredths place.

31.4415 ≈ 31.44

Therefore, the sneakers are $31.44 after the discount of 15%.

7 0

2 years ago

Which set of lengths are the side lengths

vodomira [7]

Answer: 3,4,5

Step-by-step explanation:

The right triangle theorem states the the two legs added together squared equal the hypotenuse squared

3^2+4^2=25

square root of 25 is 5 so b is 3,4,5 is the answer

8 0

2 years ago

Which is a simplified form of the expression -4(3r – 2) – 2(r + 1)?

algol13

-4(3r-2)-2(r+1)
Distribute the -4 and -2
-12r + 8 -2r -2
Combine like terms
-14r + 6
The answer is C

4 0

3 years ago

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H-E-L-P M-E please