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Irina18 [472]
3 years ago
11

A student has gotten the following grades on his tests: 87, 95, 86, and 88. He needs to have an average of 90 to receive an A fo

r the class. What is the minimum grade he must get on the last test in order to have an average of 90?
(Measures of Central Tendency and Dispersion)
Mathematics
1 answer:
PilotLPTM [1.2K]3 years ago
8 0
The student needs an average of 90 and he has the following grades :
87,95,86,88
in order to get a 90 average he has to get
 90x5=450
87+95+86+88+?=450,  356+?=450 , 450-356=94
the answer is 94
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Answer:

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<u>Rewrite the table and the choices for better understanding:</u>

<em>Enrollment at a Technical School </em>

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2009                  785                        756

2010                   740                        785

2011                    690                        710

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<h2>Solution</h2>

The question requires to find which of the options represents the solution to f(x) = s(x).

That means that you must find the year (value of x) for which the two functions, the enrollment the first year, f(x), and the enrollment the second year s(x), are equal.

The table shows that the values of f(x) and s(x) are equal to 732 (students enrolled) in the year 2012,<em> x = 2012. </em>

Thus, the correct choice is the third one:

  • The solution to f(x) = s(x) is x = 2012.
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