Question

500 students were examined in 3 subjects each subjects carring 100 marks.the students getting 120 or more but less then 150 marks was puttin pass class.a student getting 150 or more but less than 180 was put in the 2nd class and the students getting 180 or more marks was puttin 1st class .(Mean-(I-35.8),(II-52.4),(III-48.8)).,{S.D-(I-4.2),(II-5.3),(III-6.1)},[correlation-(I-r12=0.6),(IIr13-0.7),(III-r23-0.8)].i>Find the number of students in each of the three classes

Answer 1

Answer:

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