. A stone is projected vertically up with the velocity of 19.6 m/s. Calculate i. time taken by the stone to reach the maximum height. ii. how long it takes to travel 294 m below the point of projection​

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).