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blsea [12.9K]
3 years ago
5

a bookcase has 2 shelves the top shelf has 10 more than 1/3 the number of books on the bottom shelf. there are 12 books on the b

ottom shelf how many books are on the top shelf
Mathematics
1 answer:
solniwko [45]3 years ago
7 0
There would be 14 on the top shelf
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"How much do students pay, on average, for textbooks during the first semester in college? From a random sample of 400 students
dezoksy [38]

Answer: The margin of error = 3.71, confidence interval = (354.04, 361.46) and it means that mean cost is lies within the confidence interval.

Step-by-step explanation:

Since we have given that

Sample size = 400

Mean = $357.75

Standard deviation = $37.89

At 95% confidence level, z = 1.96

We first find the margin of error.

Margin of error is given by

z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1.96\times \dfrac{37.89}{\sqrt{400}}\\\\=3.71

95% confidence interval would be

\bar{x}\pm \text{margin of error}\\\\=357.75\pm 3.71\\\\=(357.75-3.71,357.75+3.71)\\\\=(354.04,361.46)

Hence, the margin of error = 3.71, confidence interval = (354.04, 361.46) and it means that mean cost is lies within the confidence interval.

7 0
3 years ago
What is a num between 234,457.7 and 234,457.8.
antoniya [11.8K]
234,457.71
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6 0
3 years ago
I need help with this equation can someone please help me
Vanyuwa [196]

Answer:

d= 24

Step-by-step explanation:

-2= d/3 - 10

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-d=-30+6

-d= -24

d= 24

6 0
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Scorpion4ik [409]

Answer:the expression is 5x - 2

Step-by-step explanation:

The number of customers in a store on the first day is represented by: (6x - 3).

The number of customers on the second day is represented by: (x - 1)

An expression to find how many more customers visited the store on the first day would be the difference between the number of customers that visited the store on the first day and the number of customers that visited the store on the second day. The expression becomes

6x - 3 - (x - 1)

= 6x - 3 - x + 1

= 6x - x - 3 + 1

= 5x - 2

7 0
3 years ago
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