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Volgvan
3 years ago
14

Can someone please help me with this and explain it for me .. can you just put the answers on the photo? It will make it easier

for me .

Mathematics
1 answer:
Bezzdna [24]3 years ago
7 0

Answer:

Step-by-step explanation:

set 30

1) 90-52 = x

38 = x

2) 90 -15-25=x

50 = x

set 31

1)   t = 3m

m = independent

t = dependent

 m    t

\left[\begin{array}{ccc}1 & 3\\2 & 6\\3 & 9\\4&12\\5&15\\6&18\end{array}\right]

2)

m = 25d

d = independent

m = dependent

 m     d

\left[\begin{array}{ccc}1&25\\2&50\\3&75\\4&100\\5&125\\6&150\\7&175\end{array}\right]

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Answers:

The z scores are approximately:

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  • Defense Against the Dark Arts:  z = 0.583
  • Transfiguration:  z = -0.263
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From those scores, we can say:

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=====================================================

Further Explanation:

We'll need to convert each given score to a corresponding standardized z score.

The formula to use is

z = (x - mu)/sigma

where,

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Let's find the z score for the Care of Magical Creatures class

z = (x - mu)/sigma

z = (3.80 - 3.75)/(0.15)

z = 0.333 approximately

Repeat this process for the Defense Against the Dark Arts score.

z = (x - mu)/sigma

z = (3.60 - 3.25)/(0.60)

z = 0.583 approximately

And for the Transfiguration class as well

z = (x - mu)/sigma

z = (3.10 - 3.20)/(0.38)

z = -0.263 approximately

The negative z score means his grade below the average, whereas earlier the other scores were above the average since he got positive z scores.

Now do the final class (Potions) to get this z score

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z = -0.533 approximately

This grade is below average as well.

----------------------------

To summarize, we have these z scores

  • Care of Magical Creatures:  z = 0.333
  • Defense Against the Dark Arts:  z = 0.583
  • Transfiguration:  z = -0.263
  • Potions: z = -0.533

Harry did his best in Defense Against the Dark Arts because the z score of 0.583 (approximate) is the largest of the four z scores. On the other hand, his worst grade is in Potions because -0.533 is the lowest z score.

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