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Dafna11 [192]
3 years ago
11

which measure of central tendancy is found by calculating the sum of all data in the set divided by the number of data values in

the set? median mean mode interquartile range
Mathematics
1 answer:
Ilia_Sergeevich [38]3 years ago
5 0
<span>The correct result to the question would be mean.

The mean (average) is found by calculating the sum of all data in the set divided by the number of data values in the set.
The median is the middle value in the list of data values.
The mode is the value which occurs most often.
</span><span>The interquartile range is the difference between the third and the first quartiles.</span>
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A recent national survey found that high school students watched an average (mean) of 7.8 movies per month with a population sta
notka56 [123]

Answer:

Step-by-step explanation:

Given that :

Mean = 7.8

Standard deviation = 0.5

sample size = 30

Sample mean = 7.3 5.4772

The null and the alternative hypothesis is as follows;

\mathbf{ H_o: \mu  \geq  7.8}

\mathbf{ H_1: \mu  <  7.8}

The test statistics can be computed as :

z = \dfrac{X- \mu}{\dfrac{\sigma}{\sqrt{n}}}

z = \dfrac{7.3- 7.8}{\dfrac{0.5}{\sqrt{30}}}

z = \dfrac{-0.5}{\dfrac{0.5}{5.4772}}

z = - 5.4772

The p-value at  0.05 significance level is:

p-value = 1- P( Z < -5.4772)

p value = 0.00001

Decision Rule:

The decision rule is to reject the null hypothesis if  p value is less than 0.05

Conclusion:

At  the 0.05 significance level,  there is sufficient information to reject the null hypothesis. Therefore ,we  conclude that college students watch fewer movies a month than high school students.

8 0
3 years ago
Evaluate the expression when a = 7 and c= -4.<br> -a+5c<br> pls help
charle [14.2K]

Answer:

-27

Step-by-step explanation:

a = 7 and c = -4

- a + 5 c

- ( 7 ) + 5 ( - 4 )

- 7 - 20

- 27

4 0
3 years ago
If someone can do this only 5 times i’ll give u a cent
Thepotemich [5.8K]

Answer:

20

Step-by-step explanation:

8x - 27 = 7x - 4

8x-7x = 24-4

x = 20

I hope im right!!

6 0
2 years ago
Explain why 1/3 is or isnt an irrational number
Afina-wow [57]

A number that cannot be expressed that way is irrational. For example, one third in decimal form is 0.33333333333333 (the threes go on forever). However, one third can be express as 1 divided by 3, and since 1 and 3 are both integers, one third is a rational number.

hope it helps!

5 0
3 years ago
Robert invested $250 in an account paying an interest rate of 4.3% compounded annually. Assuming no deposits or withdrawals are
jeka94

Answer:

18.8 years

Step-by-step explanation:

5 0
3 years ago
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