The distribution of time spent brushing teeth for the 1,200 students in a school is multimodal with a mean of 43 seconds and a standard deviation of 8.99 seconds. If a random sample of 9 students is selected, is it appropriate to
calculate the probability of the sample mean being less than 30 seconds using an approximately Normal model?
Yes, the population of 1,200 students is reasonably large in size, so the shape of the population is not a concern.
Yes, the sample of 1,200 students is a reasonably large sample size, so the shape of the population is not a concer
No, it is not appropriate to estimate the probability using an approximately Normal model because the population is
not Normal, and the sample size is small.
No, it is not appropriate to estimate the probability using an approximately Normal model because the population is
not Normal, but the sample size is reasonably large.