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algol [13]
3 years ago
7

A utility company offers a lifeline rate to any household whose electricity falls below 240 kWh during a particular month. Let A

denote the event that a randomly selected houshold in a certain community does not exceed the lifeline usage during January, and let B be the analogous event for the month of July (A and B refer to the same household). Suppose P(A) = 0.8, P(B) = 0.7, and P(A U B) = 0.9. Compute the following:
A. P(A intersection B) B. The probability that the lifeline usage amount exceeded in exactly one of the two months.  Describe this event in terms of A and B.
Mathematics
1 answer:
3241004551 [841]3 years ago
4 0

Answer:

A. 0.6

B. 0.3

Step-by-step explanation:

For part A we use the the general probability addition rule for the union of two events that states

P(A∪B) = P(A) + P(B) − P(A∩B)

Making P(A∩B) the subject of the equation above

P(A∩B) = P(A) + P(B) − P(A∪B)

P(A∩B) = 0.8 + 0.7 - 0.9

P(A∩B) = 0.6

B.

The description in terms of A and B is:

P(A but not B) + P(B but not A) = P(A∩B') + P(B∩A')

where A' is compliment of set A and B' is compliment of set B

The above description means either it exceeds in July or in January (exactly in one of the two months)

P(A∩B') = 0.8 − 0.6

P(B∩A') = 0.7 − 0.6

P(A∩B') + P(B∩A') = 0.3

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A new car is purchased for $49,000 and over time its value depreciates by one half every 5 years. What is the value of the car 2
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Principal: $49,000

Depreciation Rate: 50%

Depreciation Time: 5 years

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Plug it in: y = 49,000 (0.50)^4

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4 0
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Brainliest right now!!!!
svlad2 [7]
<h3>Answer:</h3>
  1. A
  2. B
<h3>Step-by-step explanation:</h3>

1. A decrease of 3.8% is equivalent to a multiplier fraction of -0.038. The only answer choice that has such a multiplier is A.

In an instance such as this, the "rate" is usually some (fractional) change in some period of time. Since the exponent must be unitless, the rate is effectively (some fraction) "per year" so that multiplying by "t" years cancels the units and results in a pure number.

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<em>Comment on the exponential</em>

If the actual change were -3.8% per year, the exponential term would look like (1 - 0.038)^t = 0.962^t. By writing it as e^(-0.038t), the decrease is effectively compounded continuously. As a result, over a year's time, the decrease is actually about 3.73%, not 3.8%.

_____

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