allery10 ଟି ସଂଖ୍ୟାର ହାରାହାରି 45 ଅଟେ। ସେଟ୍ରେ ଏକ ନୂତନ ସଂଖ୍ୟା, 100, ଯୋଗ କରାଗଲା। ନୂତନ ହାରାହାରି କେତେ ହେବ:
A45
B50
C55
D72.5
Answer & Solution
Correct answer: B. 50
1. ପ୍ରଥମେ ମୋଟ ମୂଲ୍ୟ ନିର୍ଣ୍ଣୟ କରନ୍ତୁ: ହାରାହାରି x ସଂଖ୍ୟା = 45 x 10 = 450।
2. ନୂତନ ସଂଖ୍ୟା ଯୋଗ କରିବା ଦ୍ୱାରା ମୋଟ ଯୋଗଫଳ ହେବ 450 + 100 = 550।
3. ଏବେ ସଂଖ୍ୟା ହେଉଛି 11।
4. ତେଣୁ ନୂତନ ହାରାହାରି ହେଉଛି 550 / 11 = 50।
5. 45 ଏବଂ 100 ର ସିଧାସଳଖ ହାରାହାରି ନେବାରୁ 72.5 ଆସିଥାଏ, ଯାହା ଏହାକୁ ଅଣଦେଖା କରେ ଯେ ଗୋଟିଏ ସଂଖ୍ୟା ଦଶଟି ସଂଖ୍ୟାକୁ ଅତିକ୍ରମ କରିପାରିବ ନାହିଁ।
_Source: syllabus Maths, Ch 13 'Statistics', S13.2 Mean of Grouped Data_
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