Answer:
Let X be the number of times the target is hit. The probability P(X≥1) then equals 1 minus the probability of missing the target three times:
P(X≥1) = 1− (1−P(A)) (1−P(B)) (1−P(C))
= 1−0.4*0.3*0.2
= 0.976
To find the probability P(X≥2) of hitting the target at least twice, you can consider two cases: either two people hit the target and one does not, or all people hit the target. We find:
P(X≥2)=(0.4*0.7*0.8)+(0.6*0.3*0.8)+(0.6*0.7*0.2)+(0.6*0.7*0.8) = 0.788
Step-by-step explanation:
Answer:
8100
Step-by-step explanation: yee yee
The volume of the cone is πr²h/3 where r=3/2 and h=5. So volume=15π/4=11.78 cu in.
Answer:
-8
0
2.89
1.091502..
Step-by-step explanation:
Rational numbers includes all positive numbers, negative numbers and zero that can be written as a ratio of one number over another.
Answer:
chance to grab both $20 bills
Step-by-step explanation:
There are ten bills in total.
The probability that the first dollar she picks is a twenty-dollar bill is 2/10 because she can pick either of the two twenty-dollar bills out of the ten in her wallet. Next, we need to pick the second bill. There are nine bills left, and only one is a twenty-dollar bill. The probability of choosing a second dollar bill is 1/9.
(2/10)*(1/9)=2/90=1/45
