Intro Statistics

What is the mode of the data?

• 9

• 6, 7

• 7, 9

• 6, 7, 9

Lizzy had test scores of:   72, 94, 108, 60
What is the RANGE of her test scores?

• 12

• 72

• 48

• 98

What is the mode in this set of numbers:
7, 14, 20, 3, 7, 14, 2, 14, 7

• 7

• 20

• 7 & 14

• none of the above

Find the median number of pets.

• 0.5

• 1

• 1.5

• 2

How many students were greater than or equal to 60 inches tall?

• 21

• 11

• 17

• 6

What percent of people chose gummy bears as their favorite candy? 

• 25%

• 15%

• 30%

• None of these

Bob is taking a 100 question test.  They have a 90 % probability of getting any one question correct.  WHICH IS THE CORRECT FORMULA TO FIND OUT THE PROBABILITY that they will answer EXACTLY 70  questions correctly?

• ₁₀₀C₇₀   ( 0.18  )³⁰ ( 0.90  )⁷⁰
  

• ₁₀₀C₇₀   ( 0.10  )³⁰ ( 0.90  )⁶⁰

• ₁₀₀C₇₀   ( 0.10  )³⁰ ( 0.90  )⁷⁰

• ₉₉C₇₀   ( 0.10  )³⁰ ( 0.90  )⁷⁰

Find the mean of a binomial distribution with n=50 and p=0.4

• 50

• 4

• 20

• 10

Is this binomial experiment? Shuffle a deck of 52 cards. Turn over the top card. Put the card back in the deck, shuffle again. Repeat the process 50 times. Let X = the number of aces you observe.

• Yes

• No, the trials are not independent.

• No, there are more than 2 outcomes

Which one of these variables is a binomial random variable?

• Time it takes a randomly selected student to complete a multiple choice exam

• Number of textbooks a randomly selected student bought this term 

• Number of women taller than 68 inches in a random sample of 5 women

• Number of CDs a randomly selected person owns