For n observations, Σ(x − 5) = 20 and Σ(x − 5)² = 160, and their mean is 6. Find n and the variance.

Question

Accepted Answer

n = 20, variance 7. Mean =5+20/n=6 n=20. Variance (shift by 5 leaves it unchanged) =160/20- (20/20 )^2=8-1=7. (8 forgets to subtract the squared mean of the deviations.)

For n observations, Σ $(x - 5) = 20$ and Σ $(x - 5)^{2} = 160$ , and their mean is 6. Find n and the variance.

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Statistics practice

For n observations, Σ(x−5)=20 and Σ(x−5)2=160, and their mean is 6. Find n and the variance.

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Statistics practice

For n observations, Σ $(x - 5) = 20$ and Σ $(x - 5)^{2} = 160$ , and their mean is 6. Find n and the variance.