Given below are some statements. Read them carefully and choose the correct statement (s) from the given options.

Statement 1: Five to fifteen classes are usually recommended in a frequency distribution.   

Statement 2: In case, we are using unequal sized class intervals, then number of classes can be the calculated by dividing the range (the difference between the largest and the smallest values of variable) by the size of the class intervals. 

None of the given statement is correct.

The correct answer is option 4: None of the given statement is correct.

Statement 1: Five to fifteen classes are usually recommended in a frequency distribution. This is incorrect. Six to fifteen classes are usually recommended in a frequency distribution.

Statement 2: In case, we are using unequal sized class intervals, then number of classes can be the calculated by dividing the range (the difference between the largest and the smallest values of variable) by the size of the class intervals. This is incorrect.  In case, we are using equal sized class intervals, then number of classes can be the calculated by dividing the range (the difference between the largest and the smallest values of variable) by the size of the class intervals.

"How many classes should we have?

The number of classes is usually between six and fifteen. In case, we are using equal sized class intervals then number of classes can be the calculated by dividing the range (the difference between the largest and the smallest values of variable) by the size of the class intervals."