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yasmincx
20.08.2019 •
Mathematics
Find the cost in dollars of the operating a 60-w lamp continuously for 1 week when the power utility rate is 18 cents/kwh .
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Ответ:
The cost in dollars is:
$ 1.8144
Step-by-step explanation:It is given that:
The 60-W lamp is operated continuously for 1 week.
We know that:
1 week=7 days
and 1 day=24 hours
This means that:
1 week=24×7
i.e. 1 week= 168 hours
Also, 1 kW=1000 W
This means that:
1 W=0.001 kW
Hence,
60-W=0. 060 KW
i.e. Power= 0.60 KW
Hence, the energy consumed is:
Energy=Power×Time
i.e.
Energy=0.060×168
i.e.
Energy=10.08 KWh
Also, cost of 1 KWh=18 cents
We know that:
1 cent=0.01 dollar
This means that:
18 cents=0.18 dollar
i.e.
Cost of 1 KWh=$ 0.18
Hence, cost of 10.08 KWh is: $ (0.18×10.08)
i.e.
Cost of 10.08 KWh is: $ 1.8144
Ответ:
Proportion of the trees will have diameters between 2 and 6 inches = 0.8164
Step-by-step explanation:
Given -
Mean
= 4
Standard deviation
= 1.5
Let X be the diameter of tree
proportion of the trees will have diameters between 2 and 6 inches =
=
Put [
]
=![P(-1.33< Z< 1.33)](/tpl/images/0588/6600/076fc.png)
=![(Z< 1.33) - (Z< -1.33)](/tpl/images/0588/6600/b8ff1.png)
= .9082 - .0918
= 0.8164