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Mariulka [41]
3 years ago
5

Reuben has scored 70, 75, 83, and 80 on four Spanish quizzes. What score must he get on the next quiz to get an average of at le

ast 80?
Mathematics
2 answers:
butalik [34]3 years ago
6 0

Answer:

Step-by-step explanation:

MY D. I. C. K.

inna [77]3 years ago
6 0

Answer:

92

Step-by-step explanation:

Let x be the additional number.

Therefore Reuben score will be

70, 75, 83, 80 and x.

From the question, we were told that the next mark will make Reuben to have an average of 80. This can be illustrated below:

Mean = sum of marks / numbers of mark

Mean = 80

Number of mark = 5

80 = (70 + 75 + 83 + 80 + x) / 5

80 = (308 + x) / 5

Cross multiply

308 + x = 80 x 5

308 + x = 400

Collect like terms

x = 400 — 308

x = 92

Reuben must score at least 92

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#7

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The Prize Place has 252 toys to be divided equally among 6 piñatas.How many toys will go into each piñata?
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8 0
3 years ago
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Wittaler [7]

Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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2 years ago
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A set of piano prices distributed at a mean of 3000 and a standard deviation of 200 dollars. An electric piano has a price of 25
lana [24]

Answer:

The proportion of piano prices higher than the electric piano is 98.3%

Step-by-step explanation:

The first thing to do here is to calculate the standard score of the price of the electric piano given.

Mathematically, this is

z-score = (x-mean)/SD

where mean is 3000 and SD is 200, x is 2576

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Now we proceed to calculate the probability of this z-score

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4 0
3 years ago
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