Pls help me answer this question
2 answers:
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Answer:
92.65 % light bulbs last less than 2080 hours
Step-by-step explanation:
We are given that The amount of time a certain brand of light bulb lasts is normally distributed
Mean =
Standard deviation =
We are supposed to find What percentage light bulbs last less than 2080 hours, to the nearest tenth
Z=1.45
Refer the z table for p value
p value = 0.9265
Hence 92.65 % light bulbs last less than 2080 hours
Answer:
<h2>Volume = 153938.0 cm³</h2>Step-by-step explanation:
Volume of a cylinder = πr²h
where
r is the radius
h is the height
From the question
h = 10 cm
diameter = 140cm
We can find the radius using the formula
radius = 70 cm
Substitute the values into the above formula and solve
That's
V = (70)²(10)π
= 4900(10)π
= 49000π
= 153938.0400
We have the final answer as
<h3>Volume = 153938.0 cm³</h3>Hope this helps you