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Paladinen [302]
3 years ago
6

A coffee cart sells coffee for $2 and tea for S1.50. On Thursday, a total of 59 cups were used to serve tea and coffee, and the

cart operator collected a total of $108.50 from tea and coffee sales. Modules Grades How many cups of tea and cups of coffee were sold? Syllabus Select the correct answer below: There were 20 cups of coffee and 39 cups of tea sold. O There were 42 cups of coffee and 17 cups of tea sold. There were 30 cups of coffee and 29 cups of tea sold. There were 40 cups of coffee and 19 cups of tea sold. There were 33 cups of coffee and 26 cups of tea sold
Mathematics
1 answer:
IrinaK [193]3 years ago
3 0

Answer:

There were 40 cups of coffee and 19 cups of tea sold.

Step-by-step explanation:

Total number of cups sold = 59

Let the number of tea cups = x

Let the number of coffee cups = y

Then, \[x+y=59\] ------------------- (1)

Total amount collected = $108.50

=> \[1.5 x + 2y = 108.50\]  -------------------- (2)

From (1), \[y=59 - x\] ------------------------ (3)

Substituting in (2):

=> \[1.5 x + 2 (59-x) = 108.50\]

=> \[1.5 x + 118- 2x = 108.50\]

=> \[-0.5 x = -9.5\]

=> \[x = 19\]

Substituting in (3):

\[y=59 - 19\]

=>\[y=40\]

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Using the Empirical Rule and the Central Limit Theorem, we have that:

  • About 68% of the sample mean fall with in the intervals $1.64 and $1.82.
  • About 99.7% of the sample mean fall with in the intervals $1.46 and $2.

<h3>What does the Empirical Rule state?</h3>

It states that, for a normally distributed random variable:

  • Approximately 68% of the measures are within 1 standard deviation of the mean.
  • Approximately 95% of the measures are within 2 standard deviations of  the mean.
  • Approximately 99.7% of the measures are within 3 standard deviations of the mean.

<h3>What does the Central Limit Theorem state?</h3>

By the Central Limit Theorem, the sampling distribution of sample means of size n has standard deviation s = \frac{\sigma}{\sqrt{n}}.

In this problem, the standard deviation of the distribution of sample means is:

s = \frac{0.657}{\sqrt{50}} = 0.09

68% of the means are within 1 standard deviation of the mean, hence the bounds are:

  • 1.73 - 0.09 = $1.64.
  • 1.73 + 0.09 = $1.82.

99.7% of the means are within 3 standard deviations of the mean, hence the bounds are:

  • 1.73 - 3 x 0.09 = $1.46.
  • 1.73 + 3 x 0.09 = $2.

More can be learned about the Empirical Rule at brainly.com/question/24537145

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5 0
2 years ago
!!! CAN SOMEONE HELP !!! (PLEASE ILL GIVE BRAINLIST)
vladimir1956 [14]

Answer:

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Step-by-step explanation:

the total bill was $58 so we have to subtract the $40 monthly bill part to find how much extra money she paid because her call was over 200 minutes

58-40=18

Then divide the $18 by $0.15 since the $18 is the total amount of each time she was charged $0.15 for going 1 minute over 200 minutes

18÷0.15 = 120

120 is te Amount Of minutes she went over her 200 minute limit

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