Answer: 0.55567
Step-by-step explanation:
Given : A certain brand of refrigerator has a useful life that is normally distributed with mean 10 years and standard deviation 3 years. The useful lives of these refrigerators are independent.
i.e.
Let 
and 
are two randomly selected refrigerator's life whose sum will exceed third selected refrigerator 
.
So that, 
Mean 
Standard deviation =
Z-score : ![z=\dfrac{X-E[x]}{\sqrt{Var[x]}}=\dfrac{0-1}{7.0156315694}\approx-0.14](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7BX-E%5Bx%5D%7D%7B%5Csqrt%7BVar%5Bx%5D%7D%7D%3D%5Cdfrac%7B0-1%7D%7B7.0156315694%7D%5Capprox-0.14)
Now , The probability that the total useful life of two(i..e n=2) randomly selected refrigerators will exceed 1.9 times the useful life of a third randomly selected refrigerator would be :-
Hence, the required probability is 0.55567.
Certainly negative number is smaller than a positive number
So the order is 0.8 , -0.4
Here 0.8 is the greatest while -0.4 is least
Hope This Helps You!
D = s-14
d+s = 76
• substitution;
(s-14)+s = 76
2s-14= 76
2s = 90
s = 45 years old for Sydney
d = s-14 = 31 years old for Devaughn
hope this helps
Answer:
ADB is the same as BDC because both sets of those angles make a triangle that look exactly the same. It has the same area and shape.
X is 9 over 2! If the question requires a decimal point, put 9/2 into the calculator!
