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2 years ago

A sample of 14 high school seniors are asked, " how many hours a week do you work?". Their responses are below.

Mathematics

1 answer:

Rainbow [258]2 years ago

4 0

The mean of the number of hours worked by these students is 14 hours.
The median is 12.5 hours.

The mean is the sum of all the hours listed divided by the number of seniors asked:

= ( 0 + 0 + 0 + 8 + 8 + 10 + 12 + 13 + 15 + 15 + 17 + 20 + 22 + 56) / 14

= 196 / 14

= 14 hours

The mean number of hours is 14 hours.

The median

Because the number of student interviewed is an even number, the median is calculated by taking the average of the two numbers in the middle.

<em>The numbers are ⇒ 12, 13</em>

Median is therefore :

= ( 12 + 13) /2

= 12.5 hours

In conclusion, the mean is 14 hours and the median is 12.5 hours.

<em>Find out more at brainly.com/question/11284383</em>

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3 years ago

A= [2, 3; 2, 1], B=[3; 5]. Find AB & BA if possible

oksano4ka [1.4K]

Answer:

The value of AB is $\left[\begin{array}{ccc}21\\11\end{array}\right]$ and it's not possible to multiply BA.

Step-by-step explanation:

Consider the provided matrices.

$A=\left[\begin{array}{ccc}2&3\\2&1\end{array}\right]$ , $B=\left[\begin{array}{ccc}3\\5\end{array}\right]$

Two matrices can be multiplied if and only if first matrix has an order m × n and second matrix has an order n × v.

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Matrix A has order 2 × 2 and matrix B has order 2 × 1. So according to rule we can multiply both the matrix as shown:

$AB=\left[\begin{array}{ccc}2&3\\2&1\end{array}\right] \left[\begin{array}{ccc}3\\5\end{array}\right]$

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Hence, the value of AB is $\left[\begin{array}{ccc}21\\11\end{array}\right]$

Now calculate the value of BA as shown:

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We can multiply two matrix if first matrix has an order m × n and second matrix has an order n × v.

That means number of column of first matrix should be equal to the number of rows of second matrix.

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