Subject
Bank Exam
Topic
Dutch-Bangla Bank Ltd. - Assistant Officer - 2017
In a certain set of numbers, 12.5 is 1.5 units of standard deviation above the mean, and 8.9 is 0.5 units of standard deviation below the mean. What is the mean of the set ?
In a certain set of numbers, 12.5 is 1.5 units of standard deviation above the mean, and 8.9 is 0.5 units of standard deviation below the mean. What is the mean of the set ?
ক)
7.2খ)
9.8গ)
10.6ঘ)
11.3ঙ)
None of theseExplanation
Solution: প্রশ্নে বলা হচ্ছে যে, 12.5 হচ্ছে আদর্শ বিচ্যুতির 1.5 ইউনিটের সমান কিন্তু গড়ের চেয়ে বড় এবং 8.9 হচ্ছে আদর্শ বিচ্যুতির 0.5 ইউনিটের সমান কিন্তু গড়ের চেয়ে ছোট । তাহলে গড় বের করতে হবে । ধরি, গড় X এবং আদর্শ বিচ্যুতি Y প্রথম প্রশ্নমতে, 12.5 = 1.5Y + X ............ (1) দ্বিতীয় প্রশ্নমতে, 8.9 = X - 0.5Y .............(2) (2) নং সমীকরণ হতে পাই 8.9 = X - 0.5Y => X = 8.9 + 0.5Y (1) নং সমীকরণে X এর মান বসিয়ে পাই 12.5 = 1.5Y + X => 12.5 = 1.5Y + 8.9 + 0.5Y Y = 1.8 (2) নং সমীকরণে Y এর মান বসিয়ে পাই 8.9 = X - 0.5Y => 8.9 = X - 0.5 1.8 => X = 8.9 + 0.9 X = 9.8Related questions
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