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Rufina [12.5K]
2 years ago
14

H-E-L-P M-E please ​

Mathematics
1 answer:
Over [174]2 years ago
5 0

Answer:

24

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 <em>X</em> = number of students who have laptops.

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

A random sample of <em>n</em> = 30 students is selected.

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

The random variable <em>X</em> follows a Binomial distribution with parameters <em>n</em> and <em>p</em>.

The mean and standard deviation of a binomial random variable <em>X</em> are:

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

Compute the mean of the random variable <em>X</em> as follows:

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

The mean of the random variable <em>X</em> is 1.11.

Compute the standard deviation of the random variable <em>X</em> 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 <em>X</em> 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
Read 2 more answers
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