To evaluate the probability that the lifespan will be between 1440 and 1465 hours will be given by:
P(1440<x<1465)
using the z-score formula we obtain:
z=(x-μ)/σ
where:
μ=1450
σ=8.5
hence
when x=1440
z=(1440-1450)/8.5
z=-1.18
P(z<-1.18)=0.1190
when x=1465
z=(1465-1450)/8.5
z=1.77
P(z<1.77)=0.9625
hence:
P(1440<x<1465)
=0.9625-0.1180
=0.8445
-(n/3)+8>6
-n+24>18
-n>-6
n<6
Answer:
Both is the anwser.
Step-by-step explanation:
Look it this way its simple 7.20 plus 6.75 equals 13.95
6.75 plus 7.20 is 13.95 theres no decimals changing in this problem meaning that both of them are correct.
If we say that because she bought her materials now she has -50 then she needs to make 215+50=$265 265/17=15,5 so she needs to sell 15
But if we dont take into account that she paid $50 beforehand then 215/17=12,6 so she has to sell 13 poems. Hope it helps
(6,-5)
5x-6(0)=30
5x=30
5x/5= 30/5
x=6
5(0)-6y=30
-6y=30
-6y/-6=30/-6
y= -5
