Please help.. work also needs to be shown and I don't know how to complete these questions

1. A gardener wants to better understand how tall sunflowers grow. She takes a random sample of 36 sunflowers and finds that they have an average height of 5.3 feet with a standard deviation of 1.2 feet. a. Find a 95% confidence interval for height of sunflowers b. Explain in words what the confidence interval you found in part (a) means. (no computation needed). c. How many sunflowers would you need in a sample to have a margin of error of 0.2