A colleague has been tutoring six students in 11th grade to prepare for the ACT. This colleague has asked you to evaluate the pe
1 answer:
Answer:
Mean value of the ACT scores
x⁻ = 18.66
Step-by-step explanation:
<u><em>Explanation:-</em></u>
Given data
Student scores were as follows: 20, 18, 16, 15, 23, 20.
Mean value or Expected value
<em> x ⁻ = ∑x/n</em>
Mean value = 18.66
<u><em>Final answer:-</em></u>
<em>Mean value of the ACT scores </em>
<em> x⁻ = 18.66</em>
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Answer:
Step-by-step explanation:
Occurrence Year seen Difference
1 1949 -
2 1956 1956 - 1949 = 7
3 1963 1963 - 1956 = 7
4 1970 1970 - 1963 = 7
Difference between each successive term of year seen = 7 years
Therefore, there is a common difference of 7 years between each successive term.
Function defining the year seen will be a linear function and will increase in the same pattern. (multiple of 7 years)
2017 - 1970 = 47 (It's not the multiple of 7)
2018 - 1970 = 48 (It's not the multiple of 7)
2019 - 1970 = 49 (multiple of 7)
2020 - 1970 = 50 (It's not the multiple of 7)
Therefore, comet will be seen next in 2019.
Option (C) will be the answer.
If a person is born in 2005
Then difference between 2005 and 1949 = 56 years
Number of times comet seen after 1949 = times
Total number of comet seen in the lifetime = 8 times
Answer:
At least 832 teenargers must be interviewed.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
How many teenagers must the firm interview in order to have a margin of error of at most 0.1 liter when constructing a 99% confidence interval
At least n teenargers must be interviewed.
n is found when M = 0.1.
We have that
So
Rounding up
At least 832 teenargers must be interviewed.