The front compound wall of a house is decorated by wooden spheres of diameter 21 cm, placed on small supports as shown in figure. Eight such spheres are used for this purpose, and are to be painted silver. Each support is a cylinder of radius 1.5 cm and height 7 cm and is to be painted black. Find the cost of paint required if silver paint costs 25 paise per cm² and black paint costs 5 paise per cm².

405.

Find the mean of each of the following distributions :

(i)

xi	10	15	20	25	30	35	40	Total
fi	4	6	8	18	6	5	3	50

(ii)

xi	12	13	14	15	16	17	18	Total
fi	1	3	4	8	10	3	1	30

(iii)

xi	50	75	100	125	150	175	200	Total
fi	12	18	50	70	25	15	10	200

The following data have been overanged in ascending order. If the median of these data is 63, then find the value of x : 29, 32, 48, 50, x, x + 2, 72, 78, 84, 95

Find the median of the following data:

95, 65, 75, 70, 75, 100, 50, 40.