Hokkendo Clinic conducted a survey on the weight (in kilograms) of patients who come to visit doctor for a period of 30 days in June 2021. A sample of 25 patients have been shown below.

55	103	66	78	71	56	44	57	43	40
33	41	78	79	58	67	60	15	27	34
79	81	97	88	77

1. Construct a stem-and-leaf display for these data.

2. Calculate the mean and standard deviation for the data.

3.Determine the skewness of the data.