The seventh grade people's education edition mathematics textbook Volume II exercises 14 1 page answer 1. The average of the four groups is 6, and the variances are 0, 4/7, 44/7 and 54/7 respectively. The greater the variance, the greater the data fluctuation, the smaller the variance, and the smaller the data fluctuation. 2. By calculating the variance of the results of A and B, it can be concluded that the result of player A is more stable. There is nothing wrong with the straight triangle. One acute angle is twice as acute as the other. Find the degree of this acute angle. 1.( 1)x & lt； 2。 (2)x>4 .(3)2