please help me solve the below question, thanks.

2. A factory manager collected a sample of ten (10) packets of 3-in-1 coffee and the weights (in grams) of each packet are recorded as follow: Calculate (a) the mean weight of a packet of 3-in-1 coffee. [3 marks] (b) the sample standard deviation of the data collected. [6 marks] (c) find a 90% confidence interval for the weights of the 3-in-1 coffee. [6 marks]