1.Three samples of five, five and five motor car tyres are drawn respectively from three brands A, B and C manufactured by three machines. The life - time of these tyres (in 1000 miles) is given below. Test whether the average life- time of the three brands of tyres are equal or not.

A

B

C

10

9

14

12

7

11

9

12

15

16

11

14

13

11

16