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krazyapril4601
15.10.2019 •
Mathematics
Ateacher has given a test to a group of students. the set of scores is: 78, 79, 79, 81, and 83. find the variance for this group of tests.
a. 2.24
b. 3.4
c. 5
d. 80
can someone also explain to me how you got the answer so i can understand it.
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Ответ:
The variance is 3.2
Step-by-step explanation:
step 1
Find the mean
[78+79+79+81+83]/5> 400/5> 80
step 2
for each number: subtract the Mean and square the result
(78-80)²>4
(79-80)²> 1
(79-80)²> 1
(81-80)²> 1
(83-80)²> 9
step 3
work out the mean of those squared differences
[4+1+1+1+9]/5> 16/5> 3.2> this value is called the "Variance"
Ответ:
61 min.
Step-by-step explanation:
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