Five pulse rates randomly selected and have a mean of 78.0 beats per minute. Four of the pulse rates are 82, 78, 56, and 84.Find the mis ing value.

Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high.Females have pulse rates with a mean of 74.0 beats per minute and a standard deviation of 12.5 beats per minute. Is a pulse rate of 44 beats per minute significantly low or significantly high? (All of these pulse rates are measured at rest.)

Which of the following is not a measure of center?

A) Mode

B) Interquartile range

C) Median

D) Mean

Norton and Jessie have a lawn service business. Sometimes they work by themselves, ancl sometimes they work together. They want to know if it is worthwhile to work together on some jobs.
Norton can edge a large lawn in about 3.0 hours. Jessie can edge a similar lawn in about 2.5 hours. Which equation could be used to find the time it would take them to edge that lawn if they worked together?
A $\frac{1}{3}-\frac{1}{2.5}=\frac{1}{t}$ B $\frac{1}{3}-\frac{1}{25}=t$ C $\frac{1}{3}+\frac{1}{2.5}=\frac{1}{t}$ D $\frac{1}{3}+\frac{1}{2.5}=t$

The quantitative data set under consideration has roughly a bell-shaped distribution. Apply the empirical rule to solve each exercise. The data set has size 80. Approximately how many observations lie within two standard deviations to either side of the mean?

Find the coefficient of variation/or each of the two samples; then compare the variation.Listed below are pulse rates (beats per minute) from samples of adult males and females. Does there appear to be a difference?

$$\begin{array} { c c c c c c c c c c c } \text{Male: }&{ 86 } & { 72 } & { 64 } & { 72 } & { 72 } & { 54 } & { 66 } & { 56 } & { 80 } & { 72 } & { 64 } & { 64 } & { 96 } & { 58 } & { 66 } \\\text{Female:}& { 64 } & { 84 } & { 82 } & { 70 } & { 74 } & { 86 } & { 90 } & { 88 } & { 90 } & { 90 } & { 94 } & { 68 } & { 90 } & { 82 } & { 80 } \end{array}$$

Biologists conducted experiments to determine whether a deficiency of carbon dioxide in the soil affects the phenotypes of peas. Listed below are the phenotype codes, where 1 = smooth-yellow, 2 = smooth-green, 3 = wrinkled yellow, and 4 = wrinkled-green.

Can the measures of variation be obtained for these values?

Do the results make sense?

$$2\quad 1\quad 1\quad 1\quad 1\quad 1\quad 1\quad 4\quad 1\quad 2\quad 2\quad 1\quad 2\quad 3\quad 3\quad 2\quad 3\quad 1\quad 3\quad 1\quad 3\quad 1\quad 3\quad 2\quad 2$$

Because the mean is very sensitive to extreme values, we say that it is not a resistant measure of center. By deleting some low values and high values, the trimmed mean is more res istant. To find the 10% trimmed mean for a data set, first arrange the data in order, then delete the bottom 10% of the values and delete the top 10% of the values, then calculate the mean of the remaining values. Use the axial loads (pounds) of aluminum cans li sted below ) for cans that are 0.0111 in . thick. An axial load is the fo rce at which the top of a can collapses. Identify any outliers, then compare the median, mean, 10% trimmed mean, and 20% trimmed mean.

$$\begin{array} { l l l l l l l l l } { 247 } & { 260 } & { 268 } & { 273 } & { 276 } & { 279 } & { 281 } & { 283 } & { 284 } & { 285 } & { 286 } & { 288 } \\ { 289 } & { 291 } & { 293 } & { 295 } & { 296 } & { 299 } & { 310 } & { 504 } \end{array}$$

Suppose that airplane engines operate independently and fail with probability equal to 0.4. Assuming that a plane makes a safe flight if at least one-half of its engines run, determine whether a 4-engine plane or a 2- engine plane has the higher probability for a successful flight.

Consider the following measures: mean, median, variance, standard deviation, percentile. Which measures utilize actual data values regardless of relative position?

In one common system for finding a grade-point average , or GPA,

$$A = 4 , B = 3 , C = 2 , D = 1 , F = 0$$

The GPA is calculated by multiplying the number of credit hours for a course and the number assigned to each grade , and then adding these products. Then divide this sum by the total number of credit hours. Because each course grade is weighted according to the number of credits of the course , GPA is called a weighted mean. Calculate the GPA for this transcript: Sociology: 3 cr. A; Biology: 3.5 cr. C; Music: 1 cr. B; Math: 4 cr. B; English: 3 cr. C.

Find the mean and median for each of the two samples, then compare the two sets of results. Listed below are pulse rates (beats per minute) from samples of adult males and females . Does there appear to be a difference?

$$\begin{matrix} \text{Male:} & \text{86} & \text{72} & \text{64} & \text{72} & \text{72} & \text{54} & \text{66} & \text{56} & \text{80} & \text{72} & \text{64} & \text{64} & \text{96} & \text{58} & \text{66}\\ \text{Female:} & \text{64} & \text{84} & \text{82} & \text{70} & \text{74} & \text{86} & \text{90} & \text{88} & \text{90} & \text{90} & \text{94} & \text{68} & \text{90} & \text{82} & \text{80}\\ \end{matrix}$$

Body temperatures of healthy adults have a bell-shaped distribution with a mean of 98.20$^\circ$ F and a standard deviation of 0.62$^\circ$ F. Using the empirical rule, what is the approximate percentage of healthy adults with body temperatures between 96.34$^\circ$ F and 100.06$^\circ$ F?

The given frequency distribution describes the speeds of drivers ticketed by the Town of Poughkeepsie police. These drivers were traveling through a 30 mi/ h speed zone on Creek Road, which passes the author's college. How does the mean compare to the posted speed limit of 30 mi/h?

$$\begin{matrix} \text{Speed} & \text{Frequency}\\ \text{42-45} & \text{25}\\ \text{46-49} & \text{14}\\ \text{50-53} & \text{7}\\ \text{54-57} & \text{3}\\ \text{58-61} & \text{1}\\ \end{matrix}$$