Solving Quadratic Equations: Quadratic Formula — Unit test

Question 1

The graph shows a distribution of data with a standard deviation of 6.

Revolt · Accepted Answer

It is within 2 standard deviations of the mean.

Question 2

The grades of a science test are normally distributed. Thanh finds that his grade on the test has a z-score of –2.5. Which statement must be true?

Revolt · Accepted Answer

Thanh’s grade is 2.5 standard deviations below the mean of the test grades.

Question 3

Miranda is conducting a poll to determine how many students would attend a students-only school dance if one was held. Which sample is most likely to yield a representative sample for the poll?

Revolt · Accepted Answer

twenty names from each grade pulled blindly from a container filled with the names of the entire student body written on slips of paper

Question 4

The conditional relative frequency table was generated using data that compares the favorite subjects of male and female students at a high school. The survey was given to 120 male students and 180 female students.

Revolt · Accepted Answer

123

Question 5

The two conditional relative frequency tables below show the results of a survey asking students whether they are taking a foreign language or not.Table B: Frequency of Foreign-Language Studies by RowWhich table could be used to answer the question "Assuming a student is taking a foreign language, what is the probability the student is also in high school?”

Revolt · Accepted Answer

Table A, because the given condition is that the student is taking a foreign language.

Question 6

A city’s annual rainfall totals are normally distributed, and the probability that the city gets more than 43.2 inches of rain in a year is given by . If the standard deviation of the city’s yearly rainfall totals is 1.8 inches, what is the city’s mean annual rainfall?

Revolt · Accepted Answer

40.5 inches

Question 7

The graph represents a distribution of data.

Revolt · Accepted Answer

50

Question 8

The conditional relative frequency table below was generated by column using data comparing gender and a person's favorite meal to cook.Which would most likely indicate an association between the categorical variables?

Revolt · Accepted Answer

The value of B is not similar to the value of C.

Question 9

Yolanda wanted to see if there was a connection between red hair and green eyes. She observed people walking past her on the street and noted their hair and eye color.Red Hair Green eyes: 18 Eye color other than green: 29Hair Color Other Than Red Green eyes: 114 Eye color other than green: 650Consider the relative frequency table.

Revolt · Accepted Answer

x = 14%

Question 10

A group of 120 people were asked whether their income level is above or below $25,000 and whether they subscribe to a movie channel. The data from the survey is shown in the Venn diagram. Use the Venn diagram to find the missing values in the frequency table.

Revolt · Accepted Answer

a = 34, b = 18, c = 68

Solving Quadratic Equations: Quadratic Formula — Unit test Answers

More from this Course

TRY EDGENUITY HACKS