SOLUTION: A 100-watt light bulb has an average brightness of 1650 lumens, with a standard deviation of 60 lumens. a) what is the probability that the 100-watt light bulb will have a brig

Question 1161230: A 100-watt light bulb has an average brightness of 1650 lumens, with a standard deviation of 60 lumens.
a) what is the probability that the 100-watt light bulb will have a brightness of more than 1740 lumens?
b) what is the probability that the 100-watt light bulb will have a brightness of less than 1600 lumens?
c) what is the probability that 100-watt light bulb will have a brightness between 1600 and 1720 lumens?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
this is z=(x-mean)/sd where for a z>(1740-1650)/60=1.5
probability z> 1.5 is 0.0668
<1600 is z<-50/60 for probability of 0.2023
c=0.6760
Can use the calculator here with 2 VARS normalcdf (1600,1720,1650,60) ENTER. Notice how it is ordered.
RELATED QUESTIONS
Light bulbs are measured in lumens (light output), watts (energy used), and hours (life). (answered by stanbon)

By what % is a 100-watt light bulb brighter than a 60-watt bulb? (answered by rfer)

In a certain city, electricity costs $0.10 per kW�h. What is the annual cost for... (answered by ikleyn,MathTherapy)

Consider the equation {{{L = .87x}}}, which gives the percent of light that will pass... (answered by Alan3354)

Intensity of a Light Bulb The farther a person is from a light bulb, the less intense... (answered by richard1234)

A light bulb company claims that the 40 watt light bulb it sells has an average life of... (answered by Theo)

given that the light intensity I(lumens) at a depth x feet in lake superior is expressed... (answered by josmiceli)

A box containing twelve 40-watt light bulbs and eighteen 60-watt light bulbs is stored in (answered by ewatrrr)

Light Bulbs have an advertised rating of 1750 lumens. If measurements are normally... (answered by ewatrrr)