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Downstream speed = 360/10 = 36 km/hour Upstream speed = 360/15 = 24 km/hour So, speed of boatman in still water = (36 + 24)/2 = 30 km/hour Therefore, required time = 480/30 = 16 hours
For the recorded observation, the coefficient of variation is 0.2 and the variance is 16. The arithmetic mean is:
If X and Y represent waiting time and service time of customers in shopping mall, have joint destiny f(x, y) = kx; 0 ≤ y ≤ x ≤ 1, then the value ...
For the given figures of production of a sugar factory, the estimate of the production for 1976 using straight line trend with origin at the year 1972 b...
Which one is parameter from population?
If A and B are manually exclusive events such that P(A)P(B) > 0 , then which option is correct?
For two items, tea (1 kg) and sugar (1 kg), the prices in the year 2019 were ₹100 and ₹50, respectively, whereas the prices in the year 2020 were â...
Which of the following methods is NOT used in computation of a seasonal index for time series?
The mode (correct to two decimal places) for the given data is:
If moment generating function of continuous random variable X is (λ /λ−t) ;t < λ, then E(X3) equals to:
Which of the following is a sources of primary data?
