Please + brainliesting. NO TROLL COMMENTS OR IF U DONT KNOW THE ANSWER, DONT ANSWER

a) 0.3125

b) 45

Step-by-step explanation:

Remark

5 students own a smart phone

11 do not.

Part A

The probability of owning a smart phone is 5/16. Where did the 16 come from.? You must use a total for the sample. You can't choose someone without a smart phone and figure out the probability of doing that if you use 11  in the denominator.

So the answer is 5/16 = 0.3125

Part B

You have to set up a proportion for this.

x / 144 = 5/16  

Notice where the 144 goes. It is across from 16. Both of them represent the total number of students. Multiply both sides by 144

x * 144 / 144 = 5 * 144/16

x = 720 / 16

x = 45

3: 2

step-by-step explanation:

shorter piece is 2: 3, so just reverse it, and you get 3: 2

m a t h w a y. c o m

step-by-step explanation: