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3 years ago

What’s the median of 70,77,80,81,82,87,88

Mathematics

2 answers:

son4ous [18]3 years ago

4 0

Answer:

The median is 81.

Step-by-step explanation:

You can find the median in the middle if it all of them add up to odd.(like your’s say 70, 77, 80,... so that You will count them all. In total you have seven numbers and it’s odd).

if it is an even numbers, you mulitply the middle two numbers and divide them by two. That is the median for even numbers.

Galina-37 [17]3 years ago

3 0

Answer:

Hello There!!

Step-by-step explanation:

You order them but in this case they are already ordered and the middle number is 81 so that is the median(also knows as the middle).

hope this helps,have a great day!!

~Pinky~

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The function f(x) varies directly with x, and f(x) = 45 when x = 9.

Paladinen [302]

Answer:

Option C = 15

Step-by-step explanation:

In principle when a function f(x) varies directly with x it suggests that any changes in x results in the equivalent changes in f(x). If we have two variables, i.e. y representing f(x) and x representing itself, any increment/decrement in x will result to the same increment/decrement in y by a factor a, thus we can say that y = ax, implying y and x have the same ratio.

In the given question we know that $f(x) = 45$ when $x=9$ , which translates as

$f(x=9) = 45$

This tells us that $f(x)$ varies by a factor (lets call it) $a$ for a given value of $x$ .

To find this factor we can just divide 45 with 9 which gives: $\frac{45}{9} = 5$

Thus the factor $a$ here is $a=5$ which finally tells us that

$f(x) = 5x$ Eqn (1) our original function.

Since we now know our function we can plug in the value for $x=3$ and solve for $f(x=3)$ as follow:

$f(x=3)= 5*3$

$f(x=3) = 15$

$f(3) = 15$

Looking at the given options in the question we can conclude that the correct answer is Option C = 15

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