Bowen Christensen
05/22/2024 · Junior High School
20. In a Mathematies proficiency test, the marks obtained by 15 students are \( 42,44,38,39,44,45,47,48 \), \( 42,36,44,40,39,34 \) and 48 . (a) Find the probability that a student chosen at random scored a mark which is (i) less than 44 , (ii) not a prime number. (iii) divisible by 11 . (b) Given that the minimum score to obtain a 'Young Mathematician' badge is 41 , find the probability (c) A student was chosen at random from those who did not obtain the badge. Find the probability that the student's mark was 39 .
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(a)
(i) \( P(\text{less than 44}) = \frac{8}{15} \)
(ii) \( P(\text{not a prime number}) = \frac{14}{15} \)
(iii) \( P(\text{divisible by 11}) = \frac{1}{5} \)
(b) \( P(\text{obtaining badge}) = \frac{3}{5} \)
(c) \( P(\text{scoring 39 | did not obtain badge}) = \frac{1}{3} \)
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