Which plan has the least amount of risk? Plan APayout P(Payout) $20,000 0.19 $30,000 0.39 $70,000 0.42 Plan BPayout P(Payout) $40,000 0.43 $50,000 0.38 $80,000 0.19
plan A
Var(X) = E(X^2) - (E(X))^2
x | p | xp | x^2 P |
20000 | 0.19 | 3800 | 76000000 |
30000 | 0.39 | 11700 | 3.51E+08 |
70000 | 0.42 | 29400 | 2.06E+09 |
44900 | 2.49E+09 | ||
variance | 468990000 | ||
sd | 21656.177 |
plan B
x | p | xp | x^2 P |
40000 | 0.43 | 17200 | 6.88E+08 |
50000 | 0.38 | 19000 | 9.5E+08 |
80000 | 0.19 | 15200 | 1.22E+09 |
51400 | 2.85E+09 | ||
variance | 212040000 | ||
sd | 14561.593 | ||
since sd(plan B) is less than sd of plan A
plan B has least amount of risk
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