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:
5 months
Step-by-step explanation:
120 * 10m = 150 * 4m
subtract 4m to 10m
120 * 6m = 150
subtract 120 to 150
6m = 30
divide 6 to 30
30 / 6 = 5
5 months
Answer:
yo you know you can use the brainly scan &solve
Step-by-step explanation:
B.shoes=$120
%D=10%
%D=10%×120÷100=$12
<h3> DISCOUNT =$12</h3><h3> S.P=M.P-D=120-12 </h3><h2> =$109</h2>
Answer:
can you flip the thing
Step-by-step explanation: