You are performing a study about the weight of preschoolers. A previous study found the weights to be normally distributed with a mean of 30 and a standard deviation of 4. You randomly sample 30 preschool children and find their weights to be as follows.

a) Draw a histogram to display these data. Use seven classes. Do the weights appear to be normally distributed? Explain.
b) Find the mean and standard deviation of your sample.
c) Is there a high probability that the mean and standard deviation of your sample are consistent with those found in previous studies? Explain your reasoning.