Question: A survey was conducted by a school to the parents about their children's online class experience. Fifteen percent of the respondents rated Excellent; 60% rated Very Satisfactory; 80% of the remaining respondents rated Satisfactory and the rest rated Needs Improvement. If 120 parents answered the survey, how many of them rated Needs Improvement? Think carefully first, then make a decision:
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The total percentage of those who rated Excellent or Very Satisfactory is 15% + 60% = 75%. Seventy - five percent of the parents is 120 x 75 / 100 = 90. Hence, 120 - 90 = 30 students rated either Satisfactory or Needs Improvement. A total of 30 x 80 / 100 = 24 parents rated Satisfactory. Therefore, 30 - 24 = 6 parents rated Needs Improvement. So the answer is 6.
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