How do you find the variance of a data set
Asked by admin @ in Mathematics viewed by 328 People
In the data set below, what is the variance? 9 8 9 5 9 If the answer is a decimal, round it to the nearest tenth. variance (σ2):
Answered by admin @
Answer:
2.4
Step-by-step explanation:
We would first calculate the mean, because we would need it to calculate our varance.
Mean= sum of the number of given data set/ total number
Mean = (9 +8 +9 +5 +9 )/5
= 40/5= 8
variance (σ2):= [(9-8)^2 + (8-8)^2 + (9-8)^2 +(5-8)^2 +(9-8)^2]/5
=( 1+ 0 + 1 +9 +1)/5
= 12/5
variance (σ2)= 12/5
=2.4
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