अंतरालों 30-35.30-40 इत्यादि का प्रयोग करते हए, एक कक्षा के 20 विद्यार्थिओं के भारों (kg में) के निम्नलिखित आंकड़ों के लिए एक बारंबारता बंटन सारणी बनाइए :
`40,38,33,48,60,53,31,46,34,36,49,41,55,49,65,42,44,47,38,39`

Construct a frequency distribution table for the data on weights ( in kg.) of 20 students of a class using intervals 30-35,35-40 and so on. 40,38,33,48,60,53,31,46,34,36,49,41,55,49,65,42,44,47,38,39.

Construct a frequency distribution table for the data on weights (in kg) of 20 studetns of a class using intervals 30-35, 35-40 and so on. 40,38, 33, 48, 53, 46, 34, 36, 49, 41, 55, 49, 65, 42, 44, 47, 38, 39.

The weights of 50 custard apples are given below . ( In grams ) 35 , 40 , 45 , 40 , 50 , 55 , 60 70 , 75 , 80 , 90 , 94 , 45 , 60 , 65 , 35 , 65 , 35 , 25 , 24 , 34 , 45 , 54 , 63 , 72 , 85 , 99 , 36 , 65 , 49 , 84 , 73 , 54 , 43 , 44 , 23 , 33 , 43 , 53 , 63 , 73 , 83 , 93 , 44 , 55 , 65 , 74 , 89 , 77 , 60 Construct a grouped frequency distribution table with classes 20 – 30 , 30 – 40 , ……………………………… 90 – 100 .

Two sections of class IX having 27 students in each section appeared for Mathematics olympiad. The marks obtained by them are shown below. 46, 31, 74, 68, 42, 54, 14, 61, 48, 37, 26, 8, 64, 57, 93, 72, 53, 59, 38, 16, 88, 56, 46, 66, 45, 61, 54, 27, 27, 44, 63, 58, 43, 81, 64, 36, 49, 50, 76, 38, 47, 77, 62, 53, 40, 71, 60, 45, 42, 34, 46, 40, 59, 42 One student is selected at random. Find the probability that selected student is having marks more than 49.