Answer: a) ![(0.99)^4](https://tex.z-dn.net/?f=%280.99%29%5E4)
Step-by-step explanation:
Given : For safety reasons, four different alarm systems were installed in the vault containing the safety deposit boxes at a Beverly Hills bank.
Each of the four systems detects theft with a probability of .99 independently of the others .
Probability for independent events
occurs together =
.
Then, the probability that when a theft occurs, all four systems will detect it
= (0.99) x (0.99) x (0.99) x (0.99)
![= (0.99)^4](https://tex.z-dn.net/?f=%3D%20%280.99%29%5E4)
Hence, the probability that when a theft occurs, all four systems will detect it is
.
Hence, the correct answer is a)
.
<u>Answer:</u>
Jet average speed was 45.5 miles per hour.
<u>Solution:
</u>
Given that a jet left airport and flew south. A passenger plane left one hour later flying at 52 miles per hour trying to catch up the jet.
After seven hours passenger plane caught up jet.
So distance travelled by passenger plane in 7 hours is same as distance travelled by jet in 7 + 1 = 8 hours as jet plane left 1 hour early.
<em>Distance travelled by passenger plane</em> = speed x time = 52 x 7 = 364 miles
So same distance that is 364 miles is travelled by jet plane in 8 hours.
![Speed = \frac{distance}{time}](https://tex.z-dn.net/?f=Speed%20%3D%20%5Cfrac%7Bdistance%7D%7Btime%7D)
=> Speed of jet =
= 45.5 miles per hour.
Hence jet average speed was 45.5 miles per hour.
There were 80 customers total whom bought mystery books in the 2 day period
I am sorry if I am false, I just woke up and I might be wrong
Answer:
The left and right sides would be the same length.
Set the two sides equal and solve for y:
10 = 2y +4
Subtract 4 from both sides:
6 = 2y
Divide both sides by 2:
y = 6/2
y = 3
plz mark brainliest
Answer:
sprint outta there and dont look back
Step-by-step explanation: