Answer:
The variance is 
Step-by-step explanation:
From the question we are told that
The sample size is n = 21
The sum of squares is 
Generally the variance is mathematically represented as

substituting values


I think this is the answer
Answer:
Step-by-step explanation:
7/11 as a percent is 63.64% rounded to the nearest hundredth. 7÷11*100=63.64