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TiliK225 [7]
2 years ago
13

The Changs updated their bedroom by purchasing a new lamp for $89.95 and a comforter set for $239.99. They paid 2007-03-04-00-00

_files/i0120000.jpg% sales tax on their purchases. If the Changs paid $351.72 total, determine if they paid the correct amount. a. The Changs family paid $0.33 too much for their purchases. b. The Changs family paid $0.99 too much for their purchases. c. The Changs family paid $5.94 too much for their purchases. d. The Changs family paid the correct amount for their purchases
Mathematics
2 answers:
Sliva [168]2 years ago
7 0

the correct answer i believe is D

natima [27]2 years ago
5 0
In order to determine the correct answer, we need to confirm it first by making the solution below:
Costs: $89.95 = New Lamp
            $239.99 = Comforter
            6 3/5% = Sales Tax (convert this to decimal and we get 6.6%)
            $351.72 = Total amount the Chang's paid
Let's get the total costs first which is $329.94
6.6% of 329.94 is $21.78
The total cost with the tax would be $351.72.
Therefore, the Chang's paid the correct amount. The correct answer would be option D. The Chang's family paid the correct amount for their purchases.
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2 years ago
6[4x(72-63) divided by 3]
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6[4x(72-63) divided by 3]

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Answer:

a) 0.0228

b) 94.6

Step-by-step explanation:

The formula for calculating a z-score when you are given a random.number of samples is z = (x-μ)/σ/√n

where x is the raw score

μ is the population mean

σ is the population standard deviation

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= x = 95

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z = 95 - 75/40/√16

= 20/40/4

= 20/10

= 2

Probability value from Z-Table:

P(x<95) = 0.97725

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b) What is the value, of which there is 97.5% chance that a sample mean is less than that value?

97.5% chance = z score for the confidence interval = 1.96

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