Question

15,16,16,18,18,19,20,20,23,23,24,25,,28,34,36,37,38,38,39,39,39,40,41,42,43,43,45,45,47,47,48,49,49,49,49,50,53,53,54,55,55,56,58,60,60,61,63,64,65

a.Represent the above data using a stem-and-leaf diagram

b.Group the data in classes 11-20,21-30,31-40 etc

c.help me to create continuous classes for each of the classes in (b)

d.From the table in (c),calculate the following:
i.Mean
ii.Median
iii.Mode
iv.Variance and starndard deviation
e.Construct the "less than" and "more than" ogive curves on the same graph.

Answer 1

b:11-20=8; 21-30=5; 31-40=9; 41-50=15; 51-60=9; 61-70=3.

c. 11-0.5=10.5; 20+0.5=20.5 u have to calculate every thing like that.

10.5-20.5 20.5-30.5 30.5-40.5 40.5-50.5 50.5-60.5 60.5-70.5

8 5 9 15 9 3

mean formula=∫fx/n

median formula=∫fm/n