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ziro4ka [17]
3 years ago
9

Which letter has reflectional, rotational, and point symmetry? O P Q L

Mathematics
1 answer:
Crazy boy [7]3 years ago
8 0
The answer should be O
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On a multiple choice test with 15 ​questions, each question has four possible​ answers, one of which is correct. For students wh
Aleks [24]

Answer:

The variance for the number of correct answers is 2.8 questions

Step-by-step explanation:

The number of correct answers follows binomial distribution, in which we have:

  • n identical and independents events: the 15 questions
  • two possibles results that we call success and fail: The answer is correct and the answer is incorrect
  • probability p of success and 1-p of fail. Probability 1/4 of get the answer correct and probability of 3/4 of get the answer incorrect. This probabilities are calculated on that way because every question have 4 possible answers and one of which is correct.

So, the variance for a variable x that follows a Binomial distributions is:

V(x)=n*p*(1-p)

Then, the variance for the number of correct answers is:

V(x)=15*(1/4)*(3/4) = 2.8125 ≈ 2.8

Because n is equal to 15, p is equal to 1/4 and (1-p) is equal to 3/4.

5 0
3 years ago
In triangle ABC, the length of side AB is 19 inches and the length of side BC is 25 inches. Which of the following could be the
Tpy6a [65]

Answer:

the answer is B -29 inches

Step-by-step explanation:

do the math they added 5 inches to 19 so just add 5 more inches

6 0
3 years ago
Ed has $5.06.<br> He finds $1.03.<br> About how much $ does he have now?
OverLord2011 [107]

Answer:

Ed now has $6.09

7 0
2 years ago
Read 2 more answers
Why did the bulletin board notice feel nervous
Gre4nikov [31]
The reason why the bulletin board notice feel nervous is: it was under a tack In most common cases, the notice that is putted under a tack is intended to be displayed on the board for a pretty long time, highlighting the importance and the urgeny of the notice.
3 0
3 years ago
If their food and beverages costs$25.30 and there is an 8% meals tax, how much is the bill
Mashutka [201]
Hey there Unrazed90,

Answer : 

100% = $25.30
1% = $25.30 / 100
      = $0.253
8% = $0.253 x 8 
      = $2.024
Total = $25.30 + $2.024
         = $27.324
         = $27

Hope this helps :D

<em>~Natasha ♥</em>
8 0
3 years ago
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