The life of light bulbs is distributed normally. The standard deviation of the lifetime is 20 hours and the mean lifetime of a b
1 answer:
Answer:
The probability of a bulb lasting for between 480 and 526 hours=0.74454
Step-by-step explanation:
We are given that
Standard deviation of the lifetime,hours
Mean, hours
We have to find the probability of a bulb lasting for between 480 and 526 hours.
Hence, the probability of a bulb lasting for between 480 and 526 hours=0.74454
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Answer:
A = 1.5 π in² ≈ 4.7 in²
Step-by-step explanation:
the area (A) of the sector is calculated as
A = area of circle × fraction of circle
= πr² ×
= π × 3² ×
= 9π ×
= 1.5π in²
≈ 4.7 in² ( to the nearest tenth )
We know the distance formula is
9)
Here A( -4,2) and B(1,4)
So length of AB
=
Also C(2,1)
Length of BC
=
So we can see that length of AB is not equal to length of BC
11.
Now AB =
Also C(2,-1) & D(4,4)
Length of CD
=
Yes AB = CD