Answer:
31 questions that are worth 7 points, 14 questions that are worth 2 points
Step-by-step explanation:
the variable s will stand for the number of 7 point questions, the variable t will stand for the number of two point questions.
7s + 2t = 245
s + t = 45
-------------
t = 45 - s
7s + 2(45 - s) = 245
7s + 90 - 2s = 245
5s + 90 = 245
5s = 155
s = 31
There are 31 questions that are worth 7 points.
7(31) + 2t = 245
217 + 2t = 245
2t = 28
t = 14
There are 14 questions that are worth 2 points
Step-by-step explanation:
y=5x
therefore, the constant proportionally is k
The valid prediction for the mean of the population possible using these samples is C. Yes, the variation of the sample means is small
<h3>What is a sample mean?</h3>
It should be noted that a sample mean is an average of a set of data . Also, the sample mean can be used to calculate the standard deviation, central tendency, and the variance of a data set.
The sample mean can be applied to a variety of uses, including calculating population averages.
Here, the sample variance is a measure of the degree to which the numbers in a list are spread out. Here, the numbers given are close to each other.
If the numbers in a list are all close to the expected values, the variance will be small and if they are far away, the variance will be large.
Therefore, the correct option is C.
Learn more about mean on:
brainly.com/question/1136789
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The answer to your equation would be: 150x0.200%=0.3
