169k views
18 votes
Pedro drives the same route to work on Monday through Friday. His route includes one traffic light. According to the local traffic department, there is a 55% chance that the light will be red when he arrives at the intersection on a randomly selected workday. Suppose we choose 10 of Pedro's workdays at random and let Y = the number of times that the light is red.

1 Answer

8 votes

Answer:

6 days

Explanation:

Given

The proportion can be represented as:


p = 55\%

And the number of days can be represented as:


n = 10

Required

Determine the expected number of times, the light is red

To do this, we simply multiply the proportion by the number of days:


Y = n * p

Substitute values for n and p


Y = 10 * 55\%

Convert percentage to decimal


Y = 10 * 0.55


Y = 5.5

Approximate


Y = 6

Hence, the expected number of days is 6 days

User Markzz
by
2.9k points