4. 1-10, 11-20, 21-30 कैसे वर्ग अंतराल हैं ?

If the class intervals of a frequency distribution are 1-10, 11-20, 21-30, …., 61-70 , Then the upper limit of 21-30 is

If 1-10, 11-20, 21-30, 31-40, ......., are the classes of a frequency distribution, then the upper boundary of the class 31-40 is _____.

If the class intervals of a frequency distribution are 1-10, 11-20, 21-30, ….,51-60 then the size of even class is

In 1-10, 11-20, 21-30,__Upper Boundary of class 11-20 is_____

0- 10, 11- 20, 21 - 30, 31 -40. The real lower limit of the class 21 - 30 is

(-11)/14-(1/21)

Classes like 1-10, 11-20, 21-30,____are called___________classes.

0-10 , 10 - 20 , 20 - 30 , ...., are the classes , the lower boundary of the class 20-30 is "_______" .

A.M. of 20, 11, 21,25, 23, 14 is

Calculate mean, variance and standard deviation of the following frequency distribution: Class 1-10 10-20 20-30 30-40 40-50 0-60 Frequency: 11 29 18 4 5 3