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It is: LX = 50+10 = 60
To find the mean you would add up all the numbers 7+9+10+11+11+12 and get 60. Then divide by how many numbers you added by, in this case 6. So 60 ÷ 6 = 10. The mean would be: 10
10 hours i assume you mean. This is 600 minutes
sqrt(6*10) = sqrt(60) = 7.75 (approx)
It's 1/10 the sum of all of those numbers.