Is the muzzle velocity a scalar or vector quantity?

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).

Select all the correct answers. which three statements about electromagnetic radiation are true?

The total amount of energy contained in an object