Bellwork March 11

A school newspaper publishes an article stating that approximately 40% of students in the school listen to classical music when studying. The newspaper explains that the poll was given to students in a randomly selected music club, where 5 of the 12 students said they listen to classical music while studying.

Which statement is true?

• The findings in the article represent the entire population because the newspaper randomly selected the club for the poll.

• The findings in the article represent the entire population because approximately 40% of the students polled listen to classical music

• The findings in the article do not represent the entire population because the club is not representative of the student population.

• The findings in the article do not represent the entire population because less than 40% of students listen to classical music.

Bert’s new high school plans to choose school colors by the end of the month. Bert surveyed 100 band students for their color preferences in the chart below.

Which statement best describes why Bert’s data is misleading?

• The population sample is not identified by age.

• 
  It does not give the percentage for each color combination.

• It does not identify the grade level of the students surveyed.

• The entire school population is not represented in the survey.

Three normal curves are shown below.

Which statement comparing the standard deviations of the curves is true?

• The standard deviation of Curve A is larger than the standard deviation of Curve B.

• The standard deviation of Curve B is larger than the standard deviation of Curve C.

• The standard deviation of Curve A is smaller than the standard deviation of Curve C.

• The standard deviation of Curve A is equal to the standard deviation of Curve C.

The weights of cereal boxes made in a factory are normally distributed with a mean of 12 ounces and a standard deviation of 0.7 ounces. If a specific cereal box has a z-score of -2.3, what is the weight of this box?

• 6.79 ounces

• 10.39 ounces

• 11.23 ounces

• 
  6.10 ounces

Employees at a company test the light bulbs that the company makes to determine how long they last. The results form a normal distribution with a mean of 150 months and a standard deviation of 15 months. What is the probability that a randomly selected light bulb will work for less than 135 months?

• 0.1587

• 0.3413

• 0.6587

• 0.8413

SAT scores for a the May test were normally distributed with a mean of 1028 and a standard deviation of 217. ACT scores for the May test were normally distributed with a mean of 19.8 and a standard deviation of 5.8.

• Sandy scored a 1147 on the May SAT.

• Russell scored a 22 on the May ACT.

Which statement best compares their scores?

• Sandy did better than Russell because 1147 is greater than 22.

• Russell did better than Sandy because his z-score is greater.

• Sandy did better than Russell because her z-score is greater.

• Sandy did better because she scored 119 above the mean, while Russell only scored 2.2 above the mean.

As the value of x gets larger, which function type will eventually exceed the others?

• Linear

• Exponential Growth

• Quadratic

• Cubic

• Absolute Value

A sheet of aluminum with a length of 14 cm and a width of 36 cm has x by x squares cut out of the corners. The sides are then folded up, and the volume of the resulting open-top box can be represented by V(x)=x(14−2x)(36−2x). Which of the following are true? Select the three statements that apply.

• 2x is the height of the open-top box

• The expression (36-2x) represents the width of the open-top box

• x values between 0 cm and 7 cm are reasonable in the context fo this situation

• The expression (14-2x) represents the width of the open top box.

• The point (0,0) is on the graph of V(x), which means the volume will be 0 when not cutting out any squares

A ball takes 5.2 seconds to roll from the top of a ramp to the bottom. The ball's initial speed is 0 meters per second, and it's speed at the bottom of the ramp is 1.4 meters per second.

Which axes show the most appropriate units and scale to graph the ball's speed as a function of time?

• 
• 
• 
• 

The prices of items at two different supermarkets are shown. Toilet paper at store A costs $4.99 and at store B costs $6.99. Toothpaste at store A costs $2.99 and at store B costs $3.25. The data for this can be represented by the following matrix:

Which statement is true about the matrix?

• The second column represents the price of toothpaste at both supermarkets.

• The first row represents the price of toilet paper at both supermarkets.

• The second row represents the cost of toothpaste at Store A.

• The first column represents the items at Store B.