Question

Help me plzzzzzZZZZZZZZZZZZZZZzzzzzzzzz

Answer 1

Answer:

Step-by-step explanation:

Dear

Formula of probability is :

Favourable Outcomes/Total Outcomes

So, according to quetion total outcomes are 100

a)8/100 = 2/25

b)9/100

c)(26+9)/100 = 35/100 = 7/20

Answer 2

Let the event that chosen student obtains less than 20% marks be A
Hence n(A)= 8
Total no. of students n(S) = 90
Hence P(A) = n(A)/n(S) = 8/90 = 4/45

Let B be the event that chosen student obtains 80% or more marks
Hence n(B)= 9
P(B) = n(B)/n(S) = 9/90 = 1/10

Let C be the event that chosen student obtains 60% or more marks
Hence n(C)= 26+9= 35
P(C) = n(C)/n(S)= 35/90= 7/18


Hope it helps uu!!!