Convert the following:
1. 250 seconds to mins
2. 98 mins to hrs​

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Which inequality has a dashed boundary line when graphed ?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).