Please keep four decimal places

You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 30 bacteria reveals a sample mean of 7 = 72 hours. It is known that lifespans have standard deviation of o=6 hours. You would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.7 hours at a 90% level of confidence. What sample size should you gather to achieve a 0.7 hour margin of error? Round your answer up to the nearest whole number. n = bacteria Submit