Question

Using assumed mean a = 30, calculate the mean of the following distribution.
Variate
10
20
30
40
50
Cumulative frequency
12
31
50
67
80​

Answer 1

Answer:

full screen it without copying 370&--7---6++-_₹@₹&+))/)!!+-6-;:"*™[]

Answer 2

Answer:

30

Step-by-step explanation:

variate cumulativefi frequency di=xi-30 difi

xi fi

10 12 12 -20 -240

20 31 19 -10 -190

30 50 19 0 0

40 67 17 10 170

50 80 13 20 260

fi=80 difi=0

• therefore,mean=a=30