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2 years ago

HYRIGH fararefant et fanter i In a class of 25 student,

Mathematics

1 answer:

Mariulka [41]2 years ago

8 0

Given:

Total students in a class = 25

Students who like volleyball = 17

Students who like basketball = 15

Students who like both = 10

To find:

The students who don't like any of the games.

Solution:

We have,

Total students in a class = 25

Students who like volleyball = 17

Students who like basketball = 15

Students who like both = 10

Now,

Students who like only volleyball = 17-10

= 7

Students who like only basketball = 15-10

= 5

Students who don't like any of the games is the difference of total number of students and number of students who like at least one game.

Students who don't like any of the games = 25 - (7+5+10)

= 25 - 22

= 3

Therefore, 3 students don't like any of the games.

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in a random sample of 28 people, the mean commute time to work was 31.2 minutes and the standard deviation was 7.3 minutes. assu

antoniya [11.8K]

Answer:

The margin of error of u is of 3.8.

The 99% confidence interval for the population mean u is between 27.4 minutes and 35 minutes.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 28 - 1 = 27

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 27 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.99}{2} = 0.995$ . So we have T = 2.7707

The margin of error is:

$M = T\frac{s}{\sqrt{n}} = 2.7707\frac{7.3}{\sqrt{28}} = 3.8$

In which s is the standard deviation of the sample and n is the size of the sample.

The margin of error of u is of 3.8.

The lower end of the interval is the sample mean subtracted by M. So it is 31.2 - 3.8 = 27.4 minutes

The upper end of the interval is the sample mean added to M. So it is 31.2 + 3.8 = 35 minutes

The 99% confidence interval for the population mean u is between 27.4 minutes and 35 minutes.

3 0

3 years ago

The members of a book club spend the same amount of money for refreshments at each meeting. At one meeting they bought 6 bagels

Tom [10]

The members of a book club spend $0.4 for each Bagel as refreshment.

Let x represent the cost of each bagel.

At a meeting, they bought 6 bagels and spent $9.00 on beverages, hence:

Cost = 6x + 9

At another meeting, they bought 8 bagels and spent $8.20 on beverages, hence:

Cost = 8x + 8.20

Since the same money is spent on each meeting, hence:

6x + 9 = 8x + 8.2

2x = 0.8

x = $0.4

Therefore the cost of each bagel is $0.4

Find out more at: brainly.com/question/13911928

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2 years ago

What are some helpful tricks to know when solving non homogenous second order differential equation

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Science is the answer

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3 years ago

A necklace regularly sells for $18.00. the store advertises a 15% discount. what is the sale price of the necklace in dollars

SSSSS [86.1K]

I can solve with 2 methods:

I. Because the discount is 15 % of 18 $ , the price will be (100-15=85) 85 % of 18 $
18*85/100= 15,3 $ ( the sale price)

II. The discount is 15 % of 18$
15*18/100= 2,7$ ( the discount)
then I decrease it from the regularly price
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Personally I believe the first is an easier method.
I hope you understand and you can apply this in every similary problem.

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3 years ago

A rectangular prism has a surface area of 8 square feet. A similar rectangular prism has a surface area of 200 square feet. How

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It would be 25 how I got that answer was I did 200 ÷ 8 and that gave me 25

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2 years ago

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