A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 99% 99 % confidence interval with a maximum error of 0.2 0.2 reproductions per hour. Assuming that the mean is 9.6 9.6 reproductions and the standard deviation is known to be 2.2 2.2 , what is the minimum sample size required for the estimate? Round your answer up to the next integer.