72% of 25 students got good narks in Mathematics, then how may people did not score good marks ?
A) 13
B) 11
C)10
D) 7
Answered Feb 05, 2023
Correct option is D) 7
Correct option is (D) 7
It is clear that rest 28% of 25 students did not score good marks.
\(\therefore\) Number of people who did not score good marks
= 28% of 25 \(=\frac{28}{100}\times25\)
\(=\frac{28}4=7\)
Correct Answer - 66.25
D) Both are true
38/50×100=76%
Correct option is (B) 144.1 cm The mean height of 10 boys \(=\frac{3\times142+7\times145}{10}\) \(=\frac{426+1015}{10}\) \(=\frac{1441}{10}\) = 144.1 cm
I thought F or H = 80 is giving by n(F u H) = n(F) + n(H) - n(F n H)
Correct Answer - c Average = `("Sum of the quantities")/("Number of the quantities")`
Correct option: c) Mental
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