Mean, Median, and Mode of Grouped Data & Frequency Distribution Tables Statistics Height (in cm) of 30 students in class FFT1073 are 137, 141, 139, 134, 171, 126, 156, 161, 158, 179, 183, 172, 164, 139, 175, 139, 137, 159, 157, 137, 153, 138, 149, 145, 170, 182, 144, 137, 179, 176.

Construct the grouped frequency table with the class interval of equal width such as 130 - 135.
By using this table, answer the following question:

1. Calculate mean of height in the class
2. Determine the modal class
3. Calculate variance
4. Calculate standard deviation​