Question

The mean of the following data is 55.5 find the missing frequencies x and y if the total is 20. Class interval :- 30-40, 40-50, 50-60, 60-70, 70-80. Frequency :- 3 , x , 7 , 7 ,y


pls step by step??​

Answer 1

42=

100

2775+25x+45y

4200=2775+25x+145y

⇒25x+45y=1425

5(5x+9y)=5×28

thank you.

Answer 2

Answer:

i don't know why I am giving answer but i will not give