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Paha777 [63]
2 years ago
9

Anastasia Subscribe to a website for processing her digital pictures The subscription is $6.25 per month and 4-by -6 inches pri

nts are $ 0.25 each how many prints dose Anastasia Purchase if the charge for January is $15.75 ?
Mathematics
1 answer:
gogolik [260]2 years ago
8 0

total cost = 6.25 + 0.25 x

15.75 - 6.25 = 0.25 x

9.5 = 0.25 x

x = 38 prints

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What is 5x(23x2)<41 please i need the answer
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Answer:

x < 41/230

Step-by-step explanation:

5x x 46 < 41

230x < 41

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Mary selects marbles from a different bag without looking at them. This bag of marbles has 5 green marbles, 3 red marbles, and 7
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i don't now the answer what is the answer

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A bag containing food has mass 3.813 kg. When the bag is empty its mass is 257 g. Find in kilograms the mass of the fruit
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I think it is 0.257 kg

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A survey of 80 students found that 24 students both play in the band and play a sport. But 22 students are not in
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第 5 个问题 a multiple choice exam has 10 questions. each question has 3 possible answers, of which one is correct. a student knows
tatuchka [14]

The chances that the student was merely guessing is 1/3.

Bayes Theorem determines the conditional probability of an event A given that event B has already occurred.

denoted by

P(A/B)=\frac{P(A)*P(B/A)}{P(B)}

let A be the  event that the student knows the answer .

B be  the  event that the student does not knows the answer .

and

E be the event he gets answer correct .

According to the given question

P(A)=\frac{4}{10} \\\\ P(B)=1-\frac{4}{10} =\frac{6}{10}

Probability that the answer is correct ,given that he knows the answer is

P(E/A)=1

Probability that the answer is correct ,given that he guesses it is

P(E/B)=\frac{1}{3}   [as the MCQ has 3 options and only one is correct]

We need to find the probability that he guesses the answer given that it is correct.

Required probability P(B/E)=\frac{P(B)*P(E/B)}{P(A)*P(E/A)+P(B)*P(E/B)}

Substituting the values we get

P(B/E)=\frac{\frac{6}{10} *\frac{1}{3} }{\frac{4}{10} *1+\frac{6}{10} *\frac{1}{3} }

=\frac{6}{30}*\frac{30}{18}  \\ \\ =\frac{6}{18} \\ \\ =\frac{1}{3}

Therefore ,  the chances that the student was merely guessing is 1/3.

Learn more about Probability here brainly.com/question/13140147

#SPJ4

8 0
1 year ago
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