so hmmm on average on the last 7 test, you get 82, so hmmm we could say that on each of the 7 tests you got 82, so you got 82, 7 times.
now, let's say in the 8th test, you get a grade of "g", now, if we were to get an average of all 8 tests, that means the average will simply be (82*7) + "g", and we know that's 84, so
Answer: 543
Step-by-step explanation:
Given : Level of confidence = 0.98
Significance level :
By using the normal distribution table,
Critical value :
Margin of error :
The formula to find the population proportion if prior proportion of population is unknown :-
Hence, the company survey minimum sample having size =543