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Who is Pythagoras?

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Rochelle Romero
Rochelle RomeroLv10
16 Sep 2020
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of the pupils in Primary 5 scored an 'A' for a test. The ratio of the number of pupils who scored a ' B 'to the number who scored on 'A' was 5:3. The rest of the pupils scored a 'C' and a  'D' in the ratio 6: 5. The pupils who scored a B were 48 more than the pupils who scored a 'C'.
(a) How many pupils were there in Primary 5 ?
(b) How many pupils foiled the test if the failure was a 'D' grade?

2/9 of the pupiles in Primary 5 scored an 'A' for a test. The ratio of the number of pupils who scored a 'B' to the number who scored an 'A' was 5:3. The rest of the pupils scored a 'C' and a 'D' in the ratio 6:5. The pupiles who scored a 'B' were 48 more than the pupils who scored a 'C'.

a. How many pupils were their in Primary 5?

b. How many pupils failed the test if the failure was a 'D' grade?

The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 90% of students now own a cell phone. Fifteen students are to be selected at random from a large university. Assume that the proportion of students who own a cell phone at this university is the same as nationwide. Let X = the number of students in the sample of 15 who own a cell phone. 14. What is the standard deviation of the number of students who own a cell phone in a simple random sample of 15 students? A) 0.077 B) 0.09 C) 1.16 D) 1.35

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