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1. A school has only four classes having 10, 20, 30 and 40 students respectively with pass percentage of 20%, 30%, 60% and 100% respectively. Find the pass-percentage of the entire school.

  • A. 0.56
  • B. 0.56
  • C. 0.56
  • D. 0.56

Answer: Option D

Explanation:

4 টি ক্লাসে মোট ছাত্র আছে=10+20+30+40=100জন ১ম ক্লাসে পাশ করে 10 এর 20%= 2 জন ২য় ক্লাসে পাশ করে 20 এর 30%=6 জন ৩য় ক্লাসে পাশ করে 30 এর 60%=18 জন ৪র্থ ক্লাসে পাশ করে 40 এর 100%=40 জন মোট পাশ করে =2+6+18+40=66 জন শতকরা পাশ করে=66100×100%=66%

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