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Tatiana [17]
3 years ago
8

A gumball machine has 78 gumballs. each person who puts a coin into the machine gets 3 gumballs. after a certain number of peopl

e get gumballs, there are 54 gumballs remaining.
Which equation could we use to estimate how many people (p) got gumballs out of the machine?
A. 80-3-50=p
B. 80÷3+50=p
C. (80+50)÷3=p
D. (80-50)÷3=p
Mathematics
2 answers:
Lesechka [4]3 years ago
8 0
D is the bast answer for this question, but, the equation should be (78-54)/3=p.
harkovskaia [24]3 years ago
3 0
The answer would be D
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Answer: 547

Step-by-step explanation: The margin of error formulae is given below as

Margin of error = critical value ×(σ/√n)

Where σ = standard deviation and n is the sample size.

From our question, margin of error = 0.08

Variance is 1.691,

hence σ = √variance = √1.691

= 1.3.

We will be using a z test for our critical value this is because a soft drink manufacturer will always produce drinks more than 30 in numbers.

The critical value for a 85% confidence interval is 1.44.

Hence critical value is 1.44.

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By cross multiplying

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√n = 23.41

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n = 547.

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