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Schach [20]
3 years ago
10

The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability

that a score is between 750 and 890.
2.28%


47.7%


50%


13.6%
Mathematics
2 answers:
mafiozo [28]3 years ago
3 0
Hey the answer is C.47.7 
goodluck!
UNO [17]3 years ago
3 0
Konichiwa! Len here
The answer is C.47.7  im vary sorry if the answer is incorrect! hope this helped!
Have a nice day 
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Answer:

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Step-by-step explanation:

Given

Correct \Marks= +5

Incorrect\ Marks= -2

Score\ Obtained = 30

Number\ of\ correct\ answers = 10

Required

Number of questions answered

First, we need to get the total correct marks obtained by Roy

This is calculated by multiplying the correct marks by number of correct answers

Total = +5 * 10

Total = +50\ marks

Subtract this from the total scores obtained; This gives the total incorrect answer obtained by Roy

Incorrect = Scores\ Obtained - Total

Incorrect = 30 - (+50)

Open bracket

Incorrect = 30 - 50

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Divide this by -2 to get the number of incorrect answers

Incorrect\ Answers = \frac{-20}{-2}

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Add this to the number of correct answers to give the total number of question answered

Total = Correct\ Answers + Incorrect\ Answers

Total = 10 + 10

Total = 20

<em>Hence, Roy answered a total of 20 questions</em>

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Answer:

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Answer:

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Step-by-step explanation:

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