1. Below is the result of a survey that was conducted in a class of 100 students about their preference of Smart phone that can download apps at a fast rate.

Smart Phones Download speed Total

Student Preference Yes No

Samsung Galaxy note 6 25 15 40

Apple I-Phone 7 Series 50 10 60

Total of all Phones 75 25 100

a) what is the probability that the students will prefer Samsung Galaxy note 6?

A.

b) What is the probability that the students will prefer the Apple I-Phone 7?

A.

c) What is the probability that the students will purchase a Smartphone?

A.

d) What is the probability that the students will not purchase any Smart Phone at all because they believe the rate of downloads of both Smart Phones are slow?

A.

Hint for Question 1: Simple probability.

2. What is the probability that the students preferred the Apple I-Phone and actually purchased the Apple I-Phone.

Where: A = Prefer Apple I-Phone, B = Actually purchased Apple I-Phone.

a) State the probability equation that the students actually purchased the Apple I-Phone they preferred.

A.

b) What is the probability that they actually purchased the Apple I-Phone they prefer.

A.

Hint for question 2: conditional probability.