Q.1. Find the mean marks of students for the following distribution:
Ans. By step deviation method
Let a = 55 and h = 10
Q.2. Determine the mean of the following distribution:
Ans. a = 45, h = 10.
Q.3. The following table shows the cumulative frequency distribution of marks of 800 students in an examination:
Construct a frequency distribution table for the data above.
Ans. Frequency distribution table: