Given that the ,mean is 8000 and the standard deviation is 1000, thus the probability that <span>tube lasts for more than 11000 hours. will be given by:
P(x>11000)
the z-score is:
z=(x-</span>μ<span>)/</span>σ
x=11000
μ=8000
σ=1000
hence:
z=(11000-8000)/1000
z=3
thus
P(x>11000)=1-P(x<11000)
But
P(x<11000)=P(z<3)=0.9987
hence
P(x>11000)=1-0.9987=0.0013
Dividing b 8 is same as mutiiplying by 1/8
144=80+64
1/8(80+64)=1/8(80)+1/8(64)=10+8=18
16 gallonsFor the first answer number six
Answer:
I read the title wrong, please remove my answer
Step-by-step explanation: