Find the mean absolute deviation of the number of kittens in 10 litters : 4,5,5,6,6,7,8,8,8,9

Step-by-step explanation:

mean=(4+5+5+6+6+7+8+8+8+9)/10=66/10=6.6

x    |x-6.6|

4      2.6  (6.6-4=2.6)

5      1.6   (6.6-5=1.6)

5      1.6

6      0.6  (6.6-6=0.6)

6      0.6

7      0.4 (7-6.6=0.4)

8      1.4  (8-6.6=1.4)

8      1.4

8      1.4

9      2.4  (9-6.6=2.4)

       14.0

mean absolute deviation=14/10=1.4

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°