Question
For the given data, n=10, X̅ = 20, Y̅ = 40,
∑(X-5)^2 = 100, ∑(Y-20)^2 =160 and ∑(X-5)*(Y-20) = 80. Calculate the correlation coefficient and comment on the validity of dataSolution
A train running at 90 km/hr crosses a vertical pole in 5 seconds and a platform in 20 seconds. Determine the length of the platform.
A train of length 400 metres crosses a man standing on platform in 16 seconds. If its speed decreases by 20%, then find the time taken by train to cros...
Two trains start at the same time from Patna and Delhi and proceed toward each other at the speed of 120 km/hr and 60 km/hr respectively. When they meet...
- A train, which is 195.5 metres long, is running at a speed of 66 km/h. It takes 40 seconds to completely cross a platform. Determine the platform’s lengt...
Train Y leaves Hyderabad at a certain time. After 7 hours Flyer Express leaves the same station and travels in the same direction at the speed of 140 km...
The lengths of trains 'P' and 'Q' are 180 metres and 120 metres respectively. Train 'P' crosses a platform 'Y' of 240 metres in 24 seconds. If 'P' and '...
Ratio of the lengths of two trains ‘X’ and ‘Y’ is 3:4 respectively and the ratio of time taken by them to cross a pole is 1:2 respectively. If s...
A train can cross a man standing on a platform of 250 metres length in 70 seconds and can cross the platform in 87.5 seconds. Find the length of the train.
- Train 'A' having a speed of 12 m/s can cross a man in 10 seconds. The length of train 'B' is 180 metres more than the length of 'A'. If the speed of 'B' is...
Train ‘X’ is travelling with a speed of 90 km/hr and crosses a vertical pole in 6 seconds. Train ‘Y’ is 30 metres longer than ‘X’ and trave...
