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:
- In the first 5 observations, total of 21 out of 25 points, hence the mean for these observations is
. - In the next n observations, mean of 1.
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:
Hey mate....
Step-by-step explanation:
This is ur answer.....
first we need to find the angle that is above 63 degrees, it will be much easier to know the next one....
= (Supplementary angle) 180 - 63
= 117
Expression = 23x + 2
= 23 x ? + 2
= (Multiplication of 23)
= 23 x 5 + 2
= <u>117</u>
SIMPLE!
Have a look on the pic given below....
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Two multiplied by x plus three plus six is equal to three multiplied by x subtracted by nine