Answer:
UwU
Step-by-step explanation:
ok good luck then
Answer:
E(X) = 0.64
Sd(X) = 0.933
Step-by-step explanation:
3(0.07) + 2(0.11) + 1(0.21)
E(X²) = 3²(0.07) + 2²(0.11) + 1²(0.21)
= 1.28
Var(X) = 1.28 - 0.64² = 0.8704
Sd = 0.933
12 liters for 4 days....12/4 = 3 liters per day
for 15 liters.....15/3 = 5 days....Lexi spent 5 days