(1) A 402-gallon tank is filled with 100 gal of pure water. A spigot is opened and a sa1t solutioncontaining 4 lb of salt per gallon of solution begins flowing into the tank at a rate of 2 gal/min. Simultaneously. a drain is opened at the bottom of the tank a1lowing the solution to leave thetank at a rate of 5 gal/min. What will be the salt content in the tank at any moment?

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.