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lora16 [44]
2 years ago
7

Amber's mean mark on five tests is 80.

Mathematics
2 answers:
OverLord2011 [107]2 years ago
8 0

Answer:

88

Step-by-step explanation:

The mean is the total sum of all the marks divided by how many there are.

68+81+74+89=312 Total of 4 tests

80×5 = 400 Total marks on 5 tests

400-312 = 88 Total marks on 5 tests - Total marks on 4 tests = 1 test

68+81+74+89+88 = 400

Mice21 [21]2 years ago
3 0

Answer:

The answer is 88.

Step-by-step explanation:

68+81+74+89+x/5=80

312+x/5=80

312+x=80*5

312+x=400

x=400-312

x=88

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2 years ago
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What is the probability that a person who is above 35 years old has a hemoglobin level of 9 or above?
lorasvet [3.4K]

Answer:

Option C. P=0.531

Step-by-step explanation:

we know that

The probability of an event is the ratio of the size of the event space to the size of the sample space.  

The size of the sample space is the total number of possible outcomes  

The event space is the number of outcomes in the event you are interested in.  

so  

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y-----> size of the sample space  (total person's age above 35 years)

so

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In this problem we have

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substitute the values

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4 0
3 years ago
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The teacher wanted to know what the average test grade was, so she added up all the grades and divided by the number of tests to
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Answer:

Mean

Step-by-step explanation:

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3 0
2 years ago
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