There is only one property used to determine whether
.
The property is called the distributive property and in a nutshell it states, , which means
is distributed through
using multiplication. So
says, distribute
to
and
which then translates into
.
Using the mean concept, it is found that we will need 15 more points to bring up his average up to 90%.
The mean of a data-set is the <u>sum of all observations divided by the number of observations</u>.
In this problem:
Hence, the mean is:
We want the mean to be of 0.9, thus:
3 more testes are need, each worth 5 points, hence, 15 more points are needed to bring up his average up to 90%.
A similar problem is given at brainly.com/question/25323941
Answer:
Step-by-step explanation:
In order to find the answer to this question you must simply divide.
Hope this helps