statistics, question 4, grade 10

4)

Consider the statistical table showing the number of articles written by 50 journalists thru 10 days:

xi 2 5 7 10 a total
ni 5 10 10 b 12 50
I.C.F.
  • Specify the population and its size,  the individual ; and the variable, its kind and its values.
  • Find a and b knowing that the range is 10.
  • Using the calculator, find the mean and the standard deviation .
  • Complete the I.C.F table , determine the median and explain its meaning.