Question

Find the class intervals if the arithmetic mean of the following distribution is 30.1, and assumed
mean is 31.5.
Step Deviation Frequency
-3 5
-2 10
-1 25
0 30
1 20
2. 10​

Answer 1

Step-by-step explanation:

class mark. frequency. class mark

-3. 5. -1.5

-2. 10. -1

-1. 25. -0.5

0. 30. 0

1. 20. 0.5

2. 10. 1

assumed mean is 31.5

frequency is 100

$31.5 = \frac{x}{100}$

x =3150

fixi =3150