Lighbulbs are sold in watt-equivelents of brightness from the old days when all
ID: 1998526 • Letter: L
Question
Lighbulbs are sold in watt-equivelents of brightness from the old days when all bulbs had filiments (pre CFL and LED). The higher the watt-equivlent the brighter the bulb. A company makes several different bulbs with different watt-equivelents. The probability of each bulb being sold is in the graph below:
Part A - Reading the graph - I
What is the probability of a 100W-equivelent bulb being purchased?
Enter a probability between 0 and 1
Part B - Reading the graph - II
What is the probability of a 40W-equivelent bulb being purchased?
Enter a probability between 0 and 1
Part C - Reading the graph - III
What is the probability of a 200W-equivelent bulb being purchased?
Enter a probability between 0 and 1
Part D - Mean
What is the average watt-equivlence for all bulbs sold?
Part E - Using
What is the probability of a given bulb being greater than, but not equal to, 100W-equivelent?
Enter as a probability between 0 and 1
0.5 0.45 -S 0.4 0.35 60 0.3 0.25 0.2 0.15 0.1 o 0.05 40W 90W 100W 150W Watt Equivelent 200WExplanation / Answer
A) The probability is 0.45 for a 100 W bulb to be purchased.
B) The probability is 0.3 for a 40 W bulb to be purchased.
C) The probability is 0.05 for a 200 W bulb to be purchased.
D) average watt equivalence = 40*0.3 + 90*0.1 + 100*0.45 + 150*0.1 + 200*0.05 = 91 W
E) A bulb higher than 100 W can be a bulb of 150 W or 200 W. Therefore the probability is 0.1 + 0.05 = 0.15 for a bulb being greater than 100 W.
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