Can someone please find the area of the shaded region and show the work??
A) 21.5 m^2
B) 25.8 m^2
C) 48.2 m^2
D) 100 m^2
E) 78.5 m^2

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.