The phone calls to a computer software help desk occur at the rate of 2.1 per minute between 3:00 p. m. and 4:00 p. m. Compute the probability that the number of calls between 3:10 p. m. and 3:15 p. m. is

The probability is 1/12

Step-by-step explanation:

Probability is given by number of possible outcomes ÷ number of total outcomes

Rate of phone calls = 2.1 per minute

Total number of calls between 3:00 p.m and 4:00 p.m (60 minutes) = 2.1 × 60 = 126

Number of calls between 3:10 p.m and 3:15 p.m (5 minutes) = 2.1 × 5 = 10.5

Probability = 10.5/126 = 1/12

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.