PSLE Pupils participating in a quiz must obtain at least a certain score in the first round to qualify for the next round. There were 80 pupils in the first round and the table shows the number of pupils for each score. 75% of the pupils did not qualify for the next round. From the table, what was the lowest score of a pupil who qualified for the next round?
Score |
Number of pupils |
0 |
7 |
5 |
19 |
10 |
34 |
15 |
9 |
20 |
6 |
25 or more |
5 |
Score |
Number of pupils |
Status |
0 |
7 |
75% of pupils did not qualify |
5 |
19 |
10 |
34 |
15 |
9 |
25% of pupils qualified
|
20 |
6 |
25 or more |
5 |
Percent of who qualified for the next round
= 100% - 75%
= 25%
Number of pupils who qualified for the next round
= 25% of pupils
=
25100 x 80
= 20
Number of pupils who score 25 or more = 5
Number of pupils who score 20 or more = 5 + 6 = 11
Number of pupils who score 15 or more = 5 + 6 + 9 = 20
Lowest score of a pupil who qualified for the next round = 15
Answer(s): 15