If the average of 201, 202, 204, 205, 206, 209, 209, 210, 212 and x?
Okay, to work out the average, we add everything and divide by the frequency of terms. From this, we get: (201+202+204+205+206+209+210+212+X)/10 = 207 We can then multiply by 10. 201+202+204+205+206+209+209+210+212+X=2070 1858 + X = 2070 Now we simply take the 1858 from both sides, X=212 And that's your value of X