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3 years ago

Help plllls help pls

Mathematics

1 answer:

k0ka [10]3 years ago

6 0

Answer:

7) Right triangle

8) Acute

9) Right triangle

10) obtuse

Step-by-step explanation:

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A true-false quiz with 10 questions was given to a statistics class. Following is the probability distribution for the score of

disa [49]

Answer:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

Step-by-step explanation:

For this case we assume the following probability distribution:

X 5 6 7 8 9 10

P(X) 0.05 0.15 0.33 0.28 0.12 0.07

First we need to find the expected value (first moment) and the second moment in order to find the variance and then the standard deviation.

In order to calculate the expected value we can use the following formula:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

In order to find the standard deviation we need to find first the second moment, given by :

$E(X^2)=\sum_{i=1}^n X^2_i P(X_i)$

And using the formula we got:

$E(X^2)=(5^2 *0.05)+(6^2 *0.15)+(7^2 *0.33)+(8^2 *0.28)+ (9^2 *0.12 +(10^2 *0.07))=57.46$

Then we can find the variance with the following formula:

$Var(X)=E(X^2)-[E(X)]^2 =57.46-(7.48)^2 =1.5096$

And then the standard deviation would be given by:

$Sd(X)=\sqrt{Var(X)}=\sqrt{1.5096}=1.229$

5 0

4 years ago

Read 2 more answers

astronauts use a tool in space that weighs 5 ounces on Earth. How many grams does the tool weigh? Round your answer to the neare

erik [133]

First you need to find how many grams is 1 ounce. 1o z.is 28.35 g, then you need to multiply 28.35 g by 5 which is 141.75. you need to round it to the nearest hundred so it is about 142 grams.

the key here would be

1 oz. = 28.35g or 1 oz. = 28 g

Hope this helps!

6 0

3 years ago

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The list of integers 15, 20, 26, x, y, 32 has a mode of 26 and an arithmetic mean of 27. What is the median of the list of numbe

OleMash [197]

Answer:

The median of the list is 26.

Step-by-step explanation:

Since the mode of the list is 26, and so far we only have one occurrence of 26 in the list, we know that one of our unknowns must equal 26.

If we set x = 26, we can then solve for y using the arithmetic mean formula. We are left with: $\frac{15+20+26+26+y+32}{6} = 27$ .

Solving for y leaves us with y=43.

Finally, we can put the list in order and find the middle values. Since the two middle values are 26, the median of the list is 26.

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3 years ago

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eduard

Answer:

hope you can understand

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2 years ago

How do I find one side of an angle

Dimas [21]

Answer: Can you explain more? you have to calculate it by an theorm

Step-by-step explanation:

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3 years ago

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Help plllls help pls​

Help plllls help pls