Find the (i) mean (ii) median (iii) first quartile (iv) third quartile (v) 9
th decile
(vi) 19th percentile for the following frequency distribution,
class 11 -15 16 -20 21 -25 26 -30 31 -35 36 - 40 41 - 45 46 - 50 51 - 55
frequency 8 15 39 47 52 41 28 16 4
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ነዐዪዪሃ ዕዐክ'ፕ ጕክዐሠ ፕዘቿ ልክነሠቿዪ ቻዐዪ ፕዘጎነ
ዘልዘልዘል ረዐረ
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