Please help me with the steps to solve it and little hints to what they are asking for.

16 of 68 - + Automatic Zoom 34. The daily high temperature in Winnipeg during the month of January is known to follow a normal distribution with a mean of -20'C. It is also known that 95% of all daily high temperatures in Winnipeg during the month of January are between -32 C and -8"C. What is the approximate value of o? (A) 3.C (B) 4.C (C) 6.C (D) 8.C (E) 12 C