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Liono4ka [1.6K]
3 years ago
10

The school store opened on the first day of school with 35 notebooks and 15 pencils. Within 2 days it sold all of those items. O

n the first day, twice as many notebooks were sold as pencils. On the second day, for every 5 notebooks sold, 2 pencils were sold. How many notebooks and how many pencils were sold on each day
Mathematics
2 answers:
frozen [14]3 years ago
5 0
On the first day, there were ten notebooks sold and five pencils sold. On the second day, there were 25 notebooks sold and 10 pencils sold.
Igoryamba3 years ago
5 0
The first day its 10 notebooks and 5 pencils. The second day its 25 notebooks and 15 pencils.
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Step-by-step explanation:

hope it helps : )

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A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1200 hours and a standar
a_sh-v [17]

Answer:

The bulbs should be replaced each 1060.5 days.

Step-by-step explanation:

Problems of normally distributed samples are 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:

\mu = 1200, \sigma = 60

How often should the bulbs be replaced so that no more than 1% burn out between replacement periods?

This is the first percentile, that is, the value of X when Z has a pvalue of 0.01. So X when Z = -2.325.

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

-2.325 = \frac{X - 1200}{60}

X - 1200 = -2.325*60

X = 1060.5

The bulbs should be replaced each 1060.5 days.

4 0
3 years ago
How many British Pounds are in 314 Japanese Yen? (1 British Pound = $1.50; 107 Yen = $1.00)
Setler [38]
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that's some weird logic but ok
4 0
3 years ago
Read 2 more answers
One kilogram of cheese costs £6.60 how much would 200g cost?
Helga [31]

Answer:

0.132

Step-by-step explanation:

if 1kg of chees cost 6.60 100g cost 0.0660 So if 0.0660 multiplied by 2        

= 0.132

7 0
3 years ago
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