Shown in the following table are the reading scores of a second-grade class given individualized instruction and the reading scores of a second-grade class given traditional instruction in the same school:

Scores	Individualized Instruction	Traditional Instruction
50-59	2	5
60-69	4	8
70-79	7	8
80-89	9	7
90-99	8	6

Find the mean and standard deviation for the traditional instruction scores.

The stem-and-leaf plot below summarizes the total deposits (in hundreds of millions of dollars) for the savings institutions in the state of Maryland in 2012.

Units: $6 \mid 5=\$ 65$ hundred million

(a) Describe the shape of the distribution.

(b) Find the median.

The table gives the average monthly high and low temperatures, in degrees Fahrenheit, for Raleigh, North Carolina, over the course of a year.

Find the mean and median for each of the given subgroups.

The low temperatures

For the following exercise, see the example mentioned.

The number of recognized blood types of various animal species is given in the following table:

In the previous exercise of the previous section, the mean was found to be 7.38.

(a) Find the variance and the standard deviation of this data.

(b) How many of these animals have blood types that are within 1 standard deviation of the mean?

Find the given areas under the standard normal curve.

Between z = -1.88 and z = 2.41

Find the given areas under the standard normal curve.

To the left of z = .38

The grade distribution for scores on a final exam is shown in the following stem-and-leaf plot:

Units: 9|8 = 98%

(a) What is the shape of the grade distribution?

(b) How many students earned 90% or better?

(c) How many students earned less than 60%?

The table gives the average monthly high and low temperatures, in degrees Fahrenheit, for Raleigh, North Carolina, over the course of a year.

Find the mean and median for each of the given subgroups.

The high temperatures

For the following exercise, see the example mentioned.

The number of hours worked in a week for 30 workers selected at random from the 2012 General Social Survey appears in the following frequency table. Find the standard deviation.

How are z-scores found for normal distributions with $\mu \neq 0$ or $\sigma \neq 1$?

Find the mean for the following data set. Round to the nearest tenth.

Earthquakes on the Richter scale:

3.5, 4.2, 5.8, 6.3, 7.1, 2.8, 3.7, 4.2, 4.2, 5.7

For the following exercise,

(a) write a frequency distribution;

(b) draw a histogram.

The data come from a random sample of 40 companies from the S&P 500.

Draw a stem-and-leaf plot for the following data. (Round to the nearest units place.)

$$\begin{array}{rrrr}39.9 & 9.7 & 9.2 & 33.3 \\ 1.4 & 10.0 & 4.0 & 57.7 \\ 5.0 & 4.4 & 28.6 & 10.4 \\ 8.1 & 4.1 & 3.6 & 2.6 \\ 65.9 & 1.8 & 3.9 & 12.5 \\ 3.6 & 2.9 & 19.4 & 11.7 \\ 6.7 & 1.7 & 15.2 & 18.1 \\ 8.2 & 10.9 & 4.2 & 2.2 \\ 24.4 & 4.4 & 16.5 & 16.3 \\ 1.6 & 10.5 & 9.6 & 5.2\end{array}$$

The data for the following exercise consist of a random sample of 40 companies that were part of the S&P 500 and information was current as of May 24, 2013. For each variable,

(a) group the data as indicated;

(b) prepare a frequency distribution with columns for intervals and frequencies;

(c) construct a histogram.

The variable is earnings per share. Use 6 intervals, starting with -5.00 to -.01, 0 to 4.99, etc.

Use the following table for the following table, which lists expenditures (in billions of dollars with the exception of Parks and Recreation, which is in millions of dollars) for a random sample of seven states. Find the range and standard deviation among the seven states for each category of government expenditure.

Education