First we have to find the mean (average) mean = (564 + 1000 + 848 + 1495 + 1348) / 5 = 5255 / 5 = 1051
now we subtract the mean from every data point, then square it 564 - 1051 = -487......-487^2 = 237169 1000 - 1051 = -51......-51^2 = 2601 848 - 1051 = -203......-203^2 = 41209 1495 - 1051 = 444......444^2 = 197136 1348 - 1051 = 297......297^2 = 88209
now find the mean of the results.....but know when ur dealing with a sample instead of the whole population, u divide by 1 number less...so instead of dividing by 5, u divide by 4. (237169 + 2601 + 41209 + 197136 + 88209) / 4 = 566324 / 4 = 141581.....this is called ur variance
now take the square root of the variance and u have ur standard deviation sqrt (141581) = 376.272 rounds to 376.27 <==
The product of 10 and a number is = 10x Twice that number means 2x 36 less than twice that number= 2x-36. It is given that....The product of 10 and a number is the same as 36 less twice that same number
