Assignment #3

1. What is the probability of rolling a 5 on one toss of a standard six-sided die? (Show your work)

1. .30
2. .40
3. .50
4. .16

1. What type of probability did Question 1 use?
2. Observed
3. Expected

3. The average (or mean) amount of hours spent on social media per day is 2 hours and the standard deviation is 2 hours. Calculate the z scores for the following individual scores:

2. Person 1 (X) = 1 hour, z= ________
4. Person 2 (X) = 3 hours, z=________
6. Person 3 (X) = 4 hours, z=________

4. Using Table A in your book or the online z table, calculate the area under the z score (to the left of the mean) for Person 1, Person 2, and Person 3.

Person 1 ________________ Person 2 ________________ Person 3 ________________

5. What is the probability that a random person's time on social media in a day would fall between Person 3 & Person 1? (Hint: Use the values you found in question 4).

______________________________________________________________

A researcher examined the colors of plants 100 people had in their homes and created the chart below.

Plant Color	Green	Pink	Red
Frequency	77	16	7

Use the chart to answer the following questions:

6. What type of probability did the researcher use?

a. Observed

b. Expected

7. What is the probability that someone would have a pink plant in their home?

8. What is the probability that someone would have a green or pink plant in their home?