The average of x1, X2, X is 3, the average of x4, X5,... X10 is 6, then the average of x1, X2,. X10 is? It's urgent

The average of x1, X2, X is 3, the average of x4, X5,... X10 is 6, then the average of x1, X2,. X10 is? It's urgent

x1+x2+x3=3*3=9
x4+x5+x6+x7+x8+x9+x10=6*7=42
The average of X1 to X10 is (9 + 42) / 10 = 5.1

If the sum of squares of 10 numbers is 370 and the variance is 33, then what is the average?

Use the formula: variance = mean square of data - mean square of data
Mean square = 370 / 10-33 = 4,
Average = 2 or - 2

If the sum of squares of 10 positive numbers is 370 and the variance is 33, then the average is ()
A. 1B. 2C. 3D. 4

According to the meaning of the question: 33 = 110 (370-10. X2), and 10 numbers are positive, so the average. X = 370 △ 10 − 33 = 2