A block suspended from string, if it has a maximum displacement of 0.28m and takes 0.40sec to complete a full cycle. what is its displacement after 0.15 sec.​

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).