Hope this helps. Let me know if you have more questions.
All our answers lie in the above statement.
Confidence Level:
The creator claims that 9 out 10 students will have the average score in the said range. Or in other words we can say that the creator is 90% confident about the result of the field test. So the confidence level is 90%.
Margin of Error:
The average score lies within 4% of 70%. This means the margin of error is 4% i.e. the average scores can deviate from 70% by 4% .
Confidence Interval:
Lower Limit = 70% - 4% = 66%
Upper Limit = 70% + 4% = 74%
Interpretation:
The exam creator is 90% confident that the average scores of seniors will be between 66% and 74%.
Morning = -2f
Afternoon = -2 + 9 f
Afternoon = 7f
Answer:
At the 4 month, the cost will be the same
Step-by-step explanation:
suppose x is the number of month.
Plan A= 40+20x
Plan B= 30x
Both plans cost the same;
40+20x =30 x
40=30x-20x
40/10=x
4=x
At the 4 month, the cost will be the same.
