Consider the following monthly returns.

Year	Month	Return in (%)
2022	6	-0.1
2022	5	-10.3
2022	4	-14.7
2022	3	12.9
2022	2	13.7
2022	1	8.8
2021	12	11.2
2021	11	24.5
2021	10	30.2
2021	9	25.6
2021	8	5.2
2021	7	21.1

a. Calculate the average monthly return in % (Round to closest 2 decimal places).

b. Calculate the standard deviation of monthly return in % (Round to closest 2 decimal places).

c. With 95% confidence, the expected return as of next month will fall in the range between -17.30% and ________(Round to closest 2 decimal places).