Stats Medic

How many students scored more than 80%?

• 10

• 13

• 7

• 15

When using IQR to find outliers, which formula will identify the lower limit?

• Q3 - 1.5(IQR)

• Q1 + 1.5(IQR)

• Q1 - 1.5(IQR)

• Q3 + 1.5(IQR)

The middle 50% of scores were between....

• 30-39

• 30-50

• 39-55

• 50-68

It is  a variable whose values are determined by chance.

• discrete random variable 

• continuous random variable 

• random variable

• none of the above 

Is this a probability distribution?

• No

• Yes

Is this a probability distribution?

• No

• Yes

• Discrete
• Continuous

If Gonzalo's score is 87%, the class average is 82%, and the SD is 4, what is Gonzalo's Z-score?

• -1.25

• +1.25

• +1.20

• +1.02

In government data, a family consists of two or more persons who live together and are related by blood or marriage. Choose an American family at random and count the number of people it contains. What is the probability that the family you choose has
more than 2 people?

• 0.35

• 0.42

• 0.58

• 1.00

The table represents the probability of guessing correct on a 5 question true-false quiz.  Find the probability for at least 4 questions correct.

• .03125

• .15625

• .3125

• .1875