Question
'A' and 'B' alone can complete a work in 10 days and 15
days, respectively. If they worked together and total wage received by them to complete the work is Rs. 600, then find the wage received by 'A'.Solution
Let total work = 30 units {LCM of 10 and 15} Efficiency of 'A' = 3 units per day Efficiency of 'B' = 2 units per day Since, they completed the whole work together therefore ratio of wage received by them will be same as the ratio of their efficiencies. So, Required wage received by 'A' = {3/(3 + 2)} X 600 = Rs. 360
The mean deviation and coefficient of mean deviation of 5 observation are 1.2 and 0.4. If the sum of the first four terms is 10, then the fifth term is...
For ANOVA table
the F - statistics is:
If the third quartile of the following data set 7,10,7,8,9 is 9.5, then the value of quartile deviation is:
With reference to index numbers, which of the following statements is true?
For a random variable x, the central moments (µi) of all order exist. The square of (2j + 1)th  moment (µ22j+1) is
The arithmetic mean of the following frequency distribution of number of accidents X on week working days is:
X:               �...
For frequency distribution presentation , which option is wrong.
Which of the following methods is NOT used in computation of a seasonal index for time series?
Which of the following satisfies the time and factor reversal test?