question_answer

  The arithmetic mean of the following frequency distribution is 25. Determine the value of p.

Class interval	0-10	10-20	20-30	30-40	40-50
Frequency	5	18	15	P	6

Answer:

  We have,

Class interval	Frequency	Mid-value
0-10 10-20 20-30 30-40 40-50	5 18 15 6	5 15 25 35 45	25 270 375 25 270

Here andusing direct method            Mean,                                         (1/2)                                                       (1) Hence,