Ex 4.2

Chapter 4 Class 8 Data Handling
Serial order wise

Transcript

Ex 4.2, 4 Numbers 1 to 10 are written on ten separate slips (one number on one slip), kept in a box and mixed well. One slip is chosen from the box without looking into it. What is the probability of . (i) getting a number 6? Total number of slips = 10 Number of Slips with 6 written on them = 1 Probability = (๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐  ๐ค๐๐กโ 6 ๐ค๐๐๐ก๐ก๐๐ ๐๐ ๐กโ๐๐)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐ ) = ๐/๐๐ Ex 4.2, 4 (ii) getting a number less than 6? Slips with a number less than 6 = 1, 2, 3, 4, 5, 6 Number of slips with a number less than 6 = 5 Probability = (๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐  ๐ค๐๐กโ ๐ ๐๐ข๐๐๐๐ ๐๐๐ ๐  ๐กโ๐๐ 6)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐ ) = 5/10 = ๐/๐ Ex 4.2, 4 (iii) getting a number greater than 6? Slip with a number greater than 6 = 7, 8, 9, 10 Number of slips greater than 6 written on them = 4 Probability = (๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐  ๐๐๐๐๐ก๐๐ ๐กโ๐๐ 6 )/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐ ) = 4/10 = ๐/๐ Ex 4.2, 4 (iv) getting a 1-digit number? One digit number = 1, 2, 3, 4, 5, 6, 7, 8, 9 โด Number of slips with one-digit number= 9 Probability = (๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐  ๐ค๐๐กโ ๐๐๐ ๐๐๐๐๐ก ๐๐ข๐๐๐๐)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐ ๐๐๐๐ ) = ๐/๐๐