A school is selling 5 mechanical pencils for 4.27. What factor could be used to calculate the cost of 54 pencils
1 answer:
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<u>Answer:</u>
Solve brackets
6(0.66x-3)>8
Multiply 6 with values in the bracket
<em>So, 6x0.66x and 6x-3</em>
4x- 18> 8
Since 4x and 18 are unlike terms, we will take 18 onto the other side, thus:
4x>8+18
4x>26
<em>Now to find the value of x, divide 4 on B.S</em>
x>
X> 6.5
OR in 'fraction form'
X>
Hope this helps :D
Answer:
The 88% confidence level for the average weight gain if between -1.30 lbs and 4.58 lbs.
Step-by-step explanation:
We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 23 - 1 = 22
88% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 22 degrees of freedom(y-axis) and a confidence level of . So we have T = 1.6176
The margin of error is:
In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 1.64 - 2.94 = -1.30 lbs
The upper end of the interval is the sample mean added to M. So it is 1.64 + 2.94 = 4.58 lbs
The 88% confidence level for the average weight gain if between -1.30 lbs and 4.58 lbs.