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NikAS [45]
3 years ago
5

an examination ,60% of the candidates failed the number of candidates who passed was 500 .find the number that failed​

Mathematics
1 answer:
Stels [109]3 years ago
6 0

Answer:

Step-by-step explanation:

If 60% failed then 40% passed

.4n=500

n=1250 so there are 1250 candidates of which

.6(1250)=750 failed

So 750 candidates failed.

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Can any one answer this question 13-5/6 pls help me
Agata [3.3K]

Answer: 13-5/6 is 12 and 1/6

Step-by-step explanation:

Mark me as brainliest if this helps!

4 0
3 years ago
Read 2 more answers
A history professor decides to give a 12-question true-false quiz. She wants to choose the passing grade such that the probabili
Katena32 [7]

Answer:

we can set the 9 as a benchmark to be the score for the passing grade so that probability of passing a student who guesses every question is less than 0.10

Step-by-step explanation:

From the given information;

Sample  size n = 12

the probability of passing a student who guesses on every question is less than 0.10

In a alternative - response question (true/false) question, the probability of answering  a question correctly  = 1/2 = 0.5

Let X be the random variable that is represent number of correct answers out of 12.

The X \sim BInomial (12, 0.5)

The probability mass function :

P(X = k) = \dfrac{n!}{k!(n-k)!} \times p^k\times (1-p)^{n-k}

P(X = 12) = \dfrac{12!}{12!(12-12)!} \times 0.5^{12}\times (1-0.5)^{12-12}

P(X = 12) = 2.44 × 10⁻⁴

P(X = 11) = \dfrac{12!}{11!(12-11)!} \times 0.5^{11}\times (1-0.5)^{12-11}

P(X =11 ) = 0.00293

P(X = 10) = \dfrac{12!}{10!(12-10)!} \times 0.5^{10}\times (1-0.5)^{12-10}

P(X = 10) = 0.01611

P(X = 9) = \dfrac{12!}{9!(12-9)!} \times 0.5^{19}\times (1-0.5)^{12-9}

P(X = 9) = 0.0537

P(X = 8) = \dfrac{12!}{8!(12-8)!} \times 0.5^{8}\times (1-0.5)^{12-8}

P(X = 8)  = 0.12085

P(X = 7) = \dfrac{12!}{7!(12-7)!} \times 0.5^{7}\times (1-0.5)^{12-7}

P(X = 7) = 0.19335

.........

We can see that,a t P(X = 9) , the probability is 0.0537 which less than 0.10 but starting from P(X = 8) downwards the probability is more than 0.01

As such, we can set the 9 as a benchmark to be the score for the passing grade so that probability of passing a student who guesses every question is less than 0.10

5 0
3 years ago
For which equation would x = 0 be a solution?
bonufazy [111]

multiplying by 0 will make the answer 0.


7 3/8(0) = 0

(7 3/8)x = 0


7 0
3 years ago
√(−x^2+3x−2)=4<br> Find the domain and solve.
MariettaO [177]

Answer:

lol this is easy use a cal  4 x

Step-by-step explanation:

4 0
3 years ago
Does (6, 4) make the equation y = 2x true?
Mekhanik [1.2K]

Answer: nope

Step-by-step explanation: using the given coordinate, that would make the problem become 4 = 2(6) which then becomes 4 = 12

So, no, it does not make the equation true.

Hope this helps!

3 0
3 years ago
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