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NNADVOKAT [17]
4 years ago
6

Assume that random guesses are made for eight multiple choice questions on an SAT test so that there are n =8 trials ,each with

probability of success (correct) given by p=0.2. find the indicated probability for the number of correct answer.
find the probability that the number x or correct answer is fewer than 4​
Mathematics
1 answer:
True [87]4 years ago
4 0

Step-by-step explanation:

consider k the numbe of correct answers

P(k) = kC8×(0,2)^k×(0,8)^(8-k)

example:

The probability of having 2 correct answers = 2C8×(0,2)^2×(0,8)^(6) = 0.294

the probability that the number x or correct answer is fewer than 4​ =

p(0) + p(1) + p(2) + p(3) = 0.944

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Ratio 15 to 6 in simplist form
tino4ka555 [31]

Answer:

5 to 3

Step-by-step explanation:

15/3=5

6/3=3

6 0
3 years ago
Read 2 more answers
5. Alea is 5 times 3 less than Leo's age. Alea is 40 years old. How old is Leo
kvv77 [185]

Answer:

Leo is 11 years old

Step-by-step explanation:

* Lets explain how to solve the problem

- Alea is 5 times 3 less than leo's age

- Alea is 40 years old

- Assume that leo's age is x

* Lets change the words to equation

∵ Leo is x years old

∵ Alea is 5 times 3 less than Leo's age

- That means when we subtract 3 from Leo's age and multiply the

 difference by 5 the result is Alea's age

∴ Alea's age = 5(x - 3)

- Multiply the two terms of the bracket by 5

∴ Alea's age = 5x - 15

∵ Alea is 40 years old

- Equate the expression of Alea's age by her age

∴ 5x - 15 = 40 ⇒ the equation to find Leo's age

- Add 15 to both sides

∴ 5x = 55

- Divide both sides by 5

∴ x = 11 ⇒ the solution of the equation

∵ x represents the Leo's age

∵ x = 11

∴ Leo is 11 years old

4 0
3 years ago
Janice gives Rs 215.50 to Mia. if she started with Rs 403.75.how much money does she have left​
stellarik [79]

Answer:

188.25

Step-by-step explanation:

Okay, so. He had 403.75. He gives 215.50 to Mia. So, we would subtract it.

403.75 - 215.50 = 188.25

Therefore they will have 188.25 left.

7 0
4 years ago
1+ 10a-5a need help on 6th grade algebra
Eva8 [605]
The answer is: 1 + 5a ; or, 5a + 1 .
______________________________
Given the expression:
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<span>1 + 10a − 5a ; 
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→ We identify the "like terms" ; 
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→ which are "10a" and ( "-5a") ;
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→ 1 + 5a ; is the most simplified; or write the expression as: 5a +1 .
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3 years ago
What are 3 anwers that equal 4 <br> in multiplication
Sergeu [11.5K]
2×2=4
1×4=4
and I guess you can also flip 1×4 around and have 4×1 as your third one?
4 0
3 years ago
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