Question
A boat takes the same amount of time to travel (x – 24)
km upstream as it takes to cover (2x – 84) km downstream. If the speed of the boat is 12 km/h and the speed of the current is 2 km/h, what is the value of x?Solution
ATQ,
(x – 24)/(12 – 2) = (2x – 84)/(12 + 2)
(x – 24)/10 = (2x – 84)/14
14x – 336 = 20x – 840
6x = 504
x = 84
So, the value of ‘x’ is 84 km.
Let x and y be two variables with variance as 1990 and 796 with 11 and 9 number of observations respectively. The value of F(10, 8) at 5% level of sign...
The value of k so that following is probability mass function
X: -2 -1 0 �...
For completely randomized design for k treatments and n observations, yif = response from the jth unit receiving ith treatment, �...
A dice was thrown 400 times and 'six' resulted 80 times. The data is used to justify the hypothesis of an unbiased dice at 95% confidence. With referen...
If Z1, Z2,…Zn are n independent standard normal variates, then Σni=1 Z2i will follow:
The mode (correct to two decimal places) for the given data is:
Which option is incorrect for the component of ti.me series.
X and Y are independent normal variables with mean 50 and 80 respectively and standard deviation as 4 and 3 respectively. What is the distribution o...
