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ser-zykov [4K]
4 years ago
15

A professor has recorded exam grades for 10 students in his​ class, but one of the grades is no longer readable. If the mean sco

re on the exam was 82 and the mean of the 9 readable scores is 84​, what is the value of the unreadable​ score?
Mathematics
1 answer:
Mkey [24]4 years ago
6 0

Answer:

64

Step-by-step explanation:

mean=\frac{sum\ of\ total\ number\ of\ score}{total\ number\ of\ students}

we have given that mean of 9 students is 84

so total score of 9 students = mean×9

                                              =84×9=756

and we have given mean score of exam is 82 and there is total 10 students so the total score of 10 students =10×82

                                                      =820

so the unreadable score = score of 10 students -score of 9 students =820-756=64

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If the average grade on an English class rose from 70 to 85 what is the approximate percent increase ?
mixer [17]

Answer: The approximate percent increase is 121.42857%. This is a rounded value. To get this, first you would need to find out which increased and in what direction. Of course, the 70 turned into an 85. So you can divide 85 by 70 and receive a number. Then in whatever form you found it, decimal, fraction, or even percent straight away, ensure the value is a percentage.

70 -> 85

85/70

About 1.21 [decimal]

1.21 x 100 = 121 [add the %]

121% [rounded]


4 0
4 years ago
Read 2 more answers
Lea buys 6 model cars that each cost $15 she also buys 4 bottles of paint that each cost $11 how much does lea spends on model c
MissTica
Times the price of the model cars to the amount bought.

$15×6= 90.

Lea paid 90 dollars for the model cars.

Now, multiply the price of the paint to the amount bought.

$11×4= 44.

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Add both together. 90+44= 134.

Therefore, Lea paid $134 for the model cars and paint all together.

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3 years ago
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8 0
3 years ago
In a recent poll, 300 people were surveyed. 70% of them said they opposed the current war/occupation. How many people stated the
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Answer:

210 people

Step-by-step explanation:

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5 0
3 years ago
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Select the three ratios that represent the numbers of blue marbles to red marbles, there are 6 blue marbles and 9 red marbles
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Answer:

6:9 or (2:3)

Step-by-step explanation:

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