The width of each of nine classes in a frequency distribution is 2.5 and the lower class boundary of the lowest class 10.6. Then the upper class boundary of the highest class is

The mid-value of a class interval is 42. If the class size is 10, then the upper and lower limits of the class are:

The number of times a particular item occurs in a given data is called its

Let l be the lower class limit of a class-interval in a frequency distribution and m be the mid-point of the class. Then, the upper class limit f the class is:

The following marks were obtained by the students in a test:

81, 72, 90, 86, 85, 92, 70, 71, 83, 89, 95, 85, 79, 62

The range of the marks is