Answer:
Increase
Step-by-step explanation:
The researcher records the following estimates: 450, 426, 310, 500, and 220.
The mean of these estimates is derived below.
Mean = (450+426+310+500+220)/5
=1906/5=381.2
If the researcher removes the estimate of 220.
The mean of the other numbers will be:
Mean =(450+426+310+500)/4
=1686/4=421.5
By comparison of the two mean, we can see that the value of the mean will increase.
There are 20 cassettes.
Step-by-step explanation:
Given,
Ratio of cassette to compact disc = 10:3
Let,
the number of cassettes = 10x
Number of compact disc = 3x
According to given statement;
the number of cassettes is 10 less than 5 times the number of compact discs.
10x = 5(Number of CD) - 10
![10x=3(5x)-10 \\10x=15x-10\\10=15x-10x\\10=5x\\5x=10](https://tex.z-dn.net/?f=10x%3D3%285x%29-10%20%5C%5C10x%3D15x-10%5C%5C10%3D15x-10x%5C%5C10%3D5x%5C%5C5x%3D10)
Dividing both sides by 5
![\frac{5x}{5}=\frac{10}{5}\\x=2](https://tex.z-dn.net/?f=%5Cfrac%7B5x%7D%7B5%7D%3D%5Cfrac%7B10%7D%7B5%7D%5C%5Cx%3D2)
Number of cassettes= 10x = 10(2) = 20
There are 20 cassettes.
Keywords: variable, ratio
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The answers are published data, survey, and observational study in that order on elearning for anyone still wondering.
Answer:
answer A
Step-by-step explanation:
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