ADDMATH PROBABILITY QUESTION
(b) A study on the body mass of a group of students is conducted and it is found that the masses of the students are normally distributed with a mean of 50 \mathrm{~kg} and a variance of 64 \mathrm{~kg}^{2}.
Suatu kajian tentang jisim badan dijalankan ke atas sekumpulan murid dan didapati bahawa jisim murid-murid itu bertaburan secara normal dengan min 50 \mathrm{~kg} dan varians 64 \mathrm{~kg}^{2}.
(i) If a student is selected randomly, calculate the probability that his mass is less than 40 \mathrm{~kg}.
Jika seorang murid dipilih secara rawak, hitung kebarangkalian bahawa jisimnya kurang daripada 40 \mathrm{~kg}.
(ii) Given 15 \% of the students have masses less than m \mathrm{~kg}. Find the value of m.
Diberi 15 \% daripada murid-murid itu mempunyai jisim kurang daripada m kg. Cari nuai m.
[6 marks/6 markah]
ADDMATH PROBABILITY SOLUTION
Thank you very much!
You are very welcome 