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pickupchik [31]
3 years ago
13

Can someone please help me on these questions?

Mathematics
2 answers:
Lilit [14]3 years ago
8 0
A is equal to 4 3/5
And b is equal to 3 1/6
sleet_krkn [62]3 years ago
7 0
The first one is equal to 4 3/5


Because we add the front and add te numerator for the battle its stay the same
The second one is 3 1/1 so it's 3 1

We jut subtrat
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-9 divided by 5/8 equals
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In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Joyce has s
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Answer:

66 ≤ f ≤100

Explanation

Mean= ( Σ x ) / n

Mean= sum of scores/ number of subject she took

Now, she already too 3 subject which sum is 85+83+86=254

Now we need to know range of score for her to have (grade) a mark between 80 and 89

Now let take the lower limit mean=80

The lowest score she can get is

Mean = ( Σx) / n

80=(85+83+86+f)/4

80×4= 254+f

Therefore, f= 320-254=66

Therefore the minimum score she can have to have a B is 66.

Then, let take the upper limit mean 89. i.e the maximum she can have so that she don't have an A grade.

Mean = ( Σx) / n

89=( 83+85+86+f)/4

89×4= 254+f

f= 356-254

f=102.

Therefore this shows that she cannot have an A grade in the exam. The maximum score for the exam is 100.

There the range of score is 66 ≤ f ≤100 to have a B grade

66 ≤ f ≤100 answer

Since she cannot score 102 in the examination.

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