大家来帮帮忙 GWD数学题

GWD--15  Q2
A certain characteristic in a large population has a distribution that is symmetric about the mean m.If 68% of the distribution lies within one standard deviation d of the mean,what percent of the distribution is less that m+d?
A.16%
B.32%
C.48%
D.84%
E.92%
2.Last year the price per share of Stock X increased by k percent and the earnings per share of Stock X increased by m percent,where k is greater than m.By what percent did the ratio of price per share to earnings per share increase,in term of k and m?
A.k/m%
B.(k-m)%
C.[100(k-m)]/(100+k)%
D[100(k-m)]/(100+m)%
E.[100(k-m)]/(100+k+m)%
GWD-25  Q20
  Based on this year's costs,an orcharde grower budgets P dollars for planting N new trees next year.If the average cost of planting each tree were to increase 25% from this year's cost,then the greastest number of trees that the orchard grower could plant next year using P dollars would be?
A.20% less than N
B.25% less than N
C.equal to N
D.20% greater than N
E.25% greater than N
The sides of a square region,mwasured to the nearest centimeter,are 6 centimeters long.The least possible value of the actual area of the square region is
A.36.00 sq cm
B.35.00 sq cm
C.33.75 sq cm
D.30.25 sq cm
E.25.00 sq cm