allery6 ଟି ସଂଖ୍ୟାର ହାରାହାରି 8 ଅଟେ। ଯଦି 12 ସଂଖ୍ୟାଟିକୁ ବାଦ୍ ଦିଆଯାଏ, ତେବେ ଅବଶିଷ୍ଟ 5 ଟିର ହାରାହାରି କେତେ ହେବ:
A7
B7.5
C7.2
D8
Answer & Solution
Correct answer: C. 7.2
1. ସମସ୍ତ ଛଅଟି ସଂଖ୍ୟାର ମୋଟ ଯୋଗଫଳ ନିର୍ଣ୍ଣୟ କରନ୍ତୁ: 8 x 6 = 48।
2. 12 ବାଦ୍ ଦେବା ପରେ ମୋଟ ଯୋଗଫଳ ରହିବ 48 - 12 = 36।
3. ପାଞ୍ଚଟି ସଂଖ୍ୟା ବାକି ରହିଲା।
4. ତେଣୁ ନୂତନ ହାରାହାରି ହେଉଛି 36 / 5 = 7.2।
5. ହାରାହାରି ହ୍ରାସ ପାଇଲା କାରଣ ବାଦ୍ ଦିଆଯାଇଥିବା ସଂଖ୍ୟା, 12, ପୁରୁଣା ହାରାହାରି 8 ଠାରୁ ଅଧିକ ଥିଲା।
_Source: syllabus Maths, Ch 13 'Statistics', S13.2 Mean of Grouped Data_
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