Answer:
3600 hours
Step-by-step explanation:
let total life time of t four transistors T = X1 + X2 + X3 + X4 (where X1,X2,X3 and X4 are life time of individual transistors
mean of the length of time that four transistors will last =E(T)=E(X1 + X2 + X3 + X4)
=E(x1) + E(x2) + E(x3) + E(x4) =900+900+900+900 =3600
and standard deviation of total time =SD(T)=sqrt(Var(T)) = sqrt(Var(X1) + Var(x2) + Var(x3) + Var(x4))
where sqrt means the square root
=sqrt(302+302+302+302) =sqrt(3600) =60
Answer:
the answer is C
Step-by-step explanation:
Answer:
that is wrong you know, right?
Step-by-step explanation:
I put the wrong answer oof
Answer:
ok I will try solve your problem. good luck
Step-by-step explanation:
a. known: Bank balances : 3021 pesos
monthly withdrawals: 78 pesos
months of withdrawal: 12 months
b. asked: new bank balance?
c. equation: New bank balance= bank balance - ( monthly withdrawals X months of withdrawal)
d. New bank balance: 3021- (78x12)
= 3021 - 936
= 2085 pesos
e. my new bank balance is 2085 pesos.