Can mode be calculated for grouped data with unequal class sizes ?

Formula to find mean for a grouped data is

The mean value can be calculated from both ungrouped and grouped date . Which one you think is more accurate ? Why ?

Vertebrates are group into these many classes

Observations of a data are 16, 72, 0, 55, 65,55, 10 and 41. Chaitanya calculated the mode and median without taking the zero into consideration. Did Chaitanya do the right thing?

Write the formula for mode of a grouped data. Explain about the symbols with their usual meanings.

Find the mode of the following data

Find the mode of the following data

A company manufactures car batteries of particular type. The life (in years) of 40 batteries was recorded as follows: Construct a grouped frequency distribution table with exclusive classes for this data, using class intervals of size 0.5 starting from the interval 2-2.5.

Calculate the mean for the following data