Class 2 scored better on average
<h3>How to determine which class scored better on average?</h3>
The averages and the standard deviations are given as:
Class 1
Mean score = 7.8
Standard deviation = 1
Class 2
Mean score = 8.1
Standard deviation = 0.2
As a general rule, the smaller the standard deviation; the better the average
Class 2 has a smaller deviation
Hence, class 2 scored better on average
Read more about standard deviation at:
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Answer:
-7/10
Explanation:
Substitute x with 3 first and you’d get 3/10(3(4)+9)-7. 3(4) is 12 plus 9 is 21. 3/10 multiplies by 21 is 6 3/10. 6 3/10 minus 7 is -7/10
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Answer:
(c) On a coordinate plane, a dashed straight line has a positive slope and goes through (0, negative 4) and (3, negative 2). Everything to the left of the line is shaded.
Step-by-step explanation:
The x-coefficient is positive, so we can determine the shading from ...
2x ... < ... (pay attention to the x-term and the inequality symbol)
That is, the solution region will have x values that are less than those on the (dashed) boundary line. Lower x-values are to the left, hence shading is on the left side of the boundary. (That's all you need to know here to make the correct choice.)
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<em>Additional comment</em>
If the choices are "above" or "below", then you will want to look at the y-term and the inequality symbol. If the coefficient of the variable of interest is negated (as it is for y here), then you need to consider the inequality symbol reversed: -y < ... ⇔ y > .... Here, that means the shading is above the line. Since the slope of the line is positive, "left" and "above" are the same thing.
A square root is equivalent to any number to the 1/2 exponent so you can simplify this to x^13/2
Like this you can make 13/2 A whole number fraction which is x^6 1/2
This is the same as x^6 × x^1/2 which can simplify to x^6 (square root of x) answer is D