The marks obtained by 17 students of a class in a test (out of 100) are given below:

90, 79, 76, 82, 46, 64, 72, 49, 68, 66, 48, 91, 82, 100, 96, 65, 84

The range data is

Mode of the data 15, 17, 15, 19, 14, 18, 15, 14, 16, 15, 14, 20, 19, 14, 15 is

For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abscissa are respectively

The class mark of the class 130-150 is

The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is