Experts plzz solve 46 Measures ot Dispersion
Q.46. A sample of 35 values has mean 80 and Standard Deviation 4. A second sample of 65
values from same population has mean 70 and standard deviation 3. Find the mean and
standard deviation of combined sample of 100 values.
[Combined: 2 735,
5.84]
Q.47. For a group of 50 male workers, the mean and standard deviation of their weekly wages
are e63 and e 9 respectively. For a group of 40 female workers, these are {54 and e 6
respectively. Find mean and standard deviation for a combined group of 90 workers.
[Combined: = 59,
2, = 91
Q.48. Coefficient of variation of two series are 58% and 69% and their standard deviation are
[Mean = 36.55 and 22.6081
21.2 and 15.6. What are their means?
(2.49. If the coefficient of variation of X series is 14.6% and that of Y series is 36.9% and their
means are 101.2 and 101.25 respectively. Find their standard deviation.
[S.D.: X - 14.775, Y = 37361
