Assignment : (1)

The probability of getting a white ball from a bag of balls is
1/4.What is the probability of not getting a white ball?

The probability of not getting a white ball is: 3/4

Step-by-step explanation:

Probability is defined as the likeliness of occurrence of an event. The probability is denoted by p.

The sum of probability of occurrence of an event and non-occurrence of an event is 1.

Let p be the probability of getting a white ball

p = 1/4

Let q be the probability of not getting a white ball

q =?

The sum of p and q will be 1.

So,

Hence,

The probability of not getting a white ball is: 3/4

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

30 people weigh 160 pounds or more