Math task

A normally distributed material has the mean value j a) We know that the mean -2-2 standard deviations is a and the mean +1 standard deviation is b. Write an expression for the mean using a and b. b) Show that the mean value u can be calculated with the expression in a) the information if a is denoted u -2u - 20 and b is denoted u + q H- 20 LL uto