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Kryger [21]
3 years ago
14

Elena works at the ticket booth of a local play house. On the opening night of the play, tickets are $10 each. The playhouse has

already sold $300 worth of tickets during a presale. How many tickets must Elena sell In order for the play house to make a total of $900?​
Mathematics
2 answers:
gavmur [86]3 years ago
4 0

Answer:

Elena needs to sell 60 tickets

Airida [17]3 years ago
4 0

Answer:

Elena must sell 90 tickets to earn $900

Step-by-step explanation:

Divide the total money needed by how much each ticket costs:

900 ÷ 10 = 90

If you're talking about how many more tickets are needed:

Subtract the total tickets needed by how many tickets Elena already sold

90 - 30 = <em>60 more tickets needed</em>

I hope this helped!

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A manufacturer of tires wants to advertise a mileage interval that ex-cludes no more than 10% of the mileage on tires he sells.
Sergio039 [100]

Answer:

This mileage interval is from 30120 miles and higher.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

All he knows is that, for a large number of tires tested, the mean mileage was 25,000 miles, and the standard deviation was 4000 miles. This means that \mu = 25000, \sigma = 4000.

A manufacturer of tires wants to advertise a mileage interval that ex-cludes no more than 10% of the mileage on tires he sells. What interval wouldyou suggest?

The lower end of this interval is X when Z has a pvalue of 0.90.  That is Z = 1.28.

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7 0
2 years ago
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Answer:

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Step-by-step explanation:

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4 0
2 years ago
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Answer:

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Step-by-step explanation:

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