a bos contain 90 dice which are numbered 1 to 90 .if one dice is drawn at random find the probality that it brars. (1)a perfect square 2)a number divisble by5
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a bos contain 90 dice which are numbered 1 to 90 .if one dice is drawn at random find the probality that it brars. (1)a perfect square 2)a number divisble by5
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Step-by-step explanation:
1) favourable outcome = 1,4,9,16,25,36,49,64,81
= 9
total outcome = 90
p of getting a perfect square = 9/90
= 1/10
2) favourable outcome = 90/5 = 18
total outcome =90
p of getting a no which is divisible by 5 = 18 /90
= 1/5
.
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Step-by-step explanation:
Total number of discs=90
1. Total number of two digit numbers between 1 and 90=81
P(getting a two digit number)=81/90=9/10
2. Perfect square between 1 and 90 are 1,4,9,16,25,36,49,64 and 81.
therefore, total number of square between 1 and 90 is 9
P(getting a perfect square)=9/90=1/10
3. Number that are between 1 and 90 and divisible by 5 are 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90. Therefore,total numbers divisible by 5=18
Probability of getting a number divisible by 5=18/90=1/5