Question

on one page of a telephone directory , there
are 200 phone numbers the frequency
destribution of their units dight of the
chosen number is 1) 5, 2) 8
units
0 1 2 3 4 5 6 7 8 9

frequency 19/22/23/19/21/24
23/ 18/ 16 /15
​

Answer 1

Answer:

Number of all telephone numbers on the given page = 200 . <br> (i) Let

be the event of choosing a number with unit's digit 6 . Number of such numbers = 14. <br>

P(getting a number with unit's digit 6) <br> =

<br> =

<br>

. <br> (ii) Let

be the event of choosing a number whose unit's digit is a nonzero ,multiple of 3 . <br> Each such number has unit's digit 3 , 6 or 9 . <br>

P (getting a number whose unit's digit is a nonzero multiple of 3) <br>