Quarter 3 Benchmark Review - Populations and Samples

An internet provider polls every fifteenth customer to determine if they are satisfied with the customer service they received when calling the company. Thirty customers are surveyed, and 12 are satisfied. What conclusion can be drawn for the 450 daily customers?

• 40% of the customers are unsatisfied with the customer service.

• Of the 450 customers, 270 would be satisfied with the customer service.

• 80% of the customers are satisfied with the customer service.

• 60% of the customers are not satisfied with the customer service.

The number of grocery items is counted in each shopper’s cart. Which statement is best supported by the information below?

• Over half of the shopping carts have more than 18 items.

• 75% of the shopping carts have 16 or more items.

• The number of shopping carts that have 20 items or more is equal to the number that have 18 items or less.

A random sample of 60 students from each grade level was surveyed regarding their favorite type of pizza. Use the table to answer the question. If there are 240 members of the 7th grade class, then how many students can be expected to prefer pepperoni pizza?

• 108

• 132

• 204

• 65

What percent of 7th grade students can be expected to prefer either supreme or cheese pizza?

• 65%

• 55%

• 57.5%

• 27.5%

Two friends record the number of chapters they read each week for 10 weeks. Which of the conclusions best supports the dot plots?

• The median number of chapters Samir read was 11.5.

• On average, Breanne read fewer chapters each week than Samir.

• The spread of the data for both dot plots is the same.

• Both Samir and Breanne had the same mode of data.

Which of the following represents the mean absolute deviation of Breanne’s data?

• 1.2

• 3.5

• 12

• 0.5

Ms. Hart's and Mr. Adair's classes are competing for the greatest number of minutes spent reading during the last week of October. Use the box plots to answer the question: Which of the following statements does not represent the data?

• The IQR for Ms. Hart’s class is greater than the IQR for Mr. Adair’s class.

• The median for Mr. Adair’s class is greater than the first quartile of Ms. Hart’s class.

• The data for Mr. Adair’s class has more variability than the data for Ms. Hart’s class.

• The median for Ms. Hart’s class is greater than over 50% of the data for Mr. Adair’s class.

Which of the following represents the difference in centers of Ms. Hart’s and Mr. Adair’s class?

• 60

• 30

• 45

• 10

Data is collected from a random sample of 50 people at the grocery store. If the grocery store has 425 customers in one day, then which of the following conclusions can be drawn?

• Exactly 28% of the customers chose to shop in store.

• 168 customers can be expected to order groceries using curbside pickup.

• Exactly 88% of the customers chose to shop in store or pickup with curbside.

• Curbside and delivery orders represent over half of the grocery orders.

The data set below represents the different costs of chairs at a furniture store.

$248, $207, $317, $282, $119, $233, $251, $304

What is the median of the first half of the data? (first quartile)

• $220

• $210

• $230

• $240