Anne guesses incorrectly what everyone is doing. Answer her questions based on the provided image.

Image: Laurence and Nayah sing.

Model: An image of a boy playing video games.

Olivier t$\'e$l$\'e$phone? Non, il ne t$\'e$l$\'e$phone pas. Il joue aux jeux vid/$\'e$o.

Determine whether a probability distribution is given. If a probability distribution is given, find its mean and standard deviation. If a probability distribution is not given, identify the requirements that are not satisfied. In a survey, cell phone users were asked which ear they use to hear their cell phone, and the table is based on their responses (based on data from "Hemispheric Dominance and Cell Phone Use," by Seidman et al., JAMA Otolaryngology-Head & Neck Surgery, Vol. 139, No. 5).

$$\begin{matrix} \text{x} & \text{P(x)}\\ \text{Left} & \text{0.636}\\ \text{Right} & \text{0.304}\\ \text{No preference} & \text{0.060}\\ \end{matrix}$$

Hong Kong reported approximately $1,500$ cellular phone super $1,000$ people. Express the number of phones per person as a whole or mixed number.

Write an algebraic expression that models each situation. You had 250 minutes left on your cell phone, and you talk an hour a week.

Joy added 26 new contacts to her phone list. She had to delete 15 old contacts before she could add any more. Joy now has a total of 100 contacts. Let $c$ represent how many contacts she had on her phone list before she updated it. Write an equation and then solve for $c$.

Write the following (which are not SI units) using prefixes (but not their abbreviations). For example, $10^3$ meters $=$ 1 kilometer:

$(e)$ $10^6$ phone.

The cost to place a collect call was $1.50 for the first minute plus$$1.00$ for each additional minute. What was the cost of a 5 -minute phone call?

Cell Phone Subscribers The numbers of cellular phone subscribers y (in millions) in the United States from 1990 through 2002, where x is the year, are shown as data points (x, y). (1990,5.3) (1991,7.6) (1992,11.0) (1993,16.0) (1994,24.1) (1995,33.8) (1996,44.0) (1997,55.3) (1998,69.2) (1999,86.0) (2000, 109.5) (2001, 128.4) (2002,140.8) Write a short paragraph explaining the meanings of the slope and $y$-intercept of the line in terms of the data.

The Pew Internet and American Life Project interviewed several hundred teens (aged 12 to 17). One question asked was, "How often do you take your cell phone to school?" Here is a two-way table of the responses by how permissive the school is with regard to cell phone use.

$$\begin{array}{lccc} \hline & & \text{Allow In} &\\ & & \text{School but} & \text{Allow}\\ \text{Frequency} & \text{Forbid} & \text{Not in Class} & \text{In Class}\\ \hline \text{Never} & 25 & 19 & 4\\ \text{Less often} & 14 & 3 & 1 6\\ \text{At least several times per week} & 14 & 23 & 8\\ \text{Every day} & 97 & 314 & 57\\ \hline \end{array}$$

The result from the earlier exercise is part of

(a) the marginal distribution of the frequency at which a teen brought a cell phone to school.

(b) the conditional distribution of school permissiveness among those who brought a cell phone to school every day.

(c) the conditional distribution of the frequency at which a teen brought a cell phone to school among schools that forbid cell phones.

The cost of a telephone call between Denver and Boise is $0.60 for the first minute and$0.42 for each additional minute or portion of a minute. A model for the total cost $C$ (in dollars) of the phone call is $C=0.60-0.42 \llbracket 1-t \rrbracket, t>0$ where $t$ is the length of the phone call in minutes. Determine the cost of a call lasting 12 minutes and 30 seconds.

Frank and Allie purchased cell phone plans through different providers. Their costs for several minutes are shown. Graph each plan to determine whose plan is proportional to the number of minutes the phone is used. Explain your reasoning.

$$\begin{matrix} \text{Cell Phone Plans}\\ \text{Time (min)} & \text{Frank's Cost (\$)} & \text{Allie's Cost (\$)}\\ \text{0} & \text{0} & \text{4.00}\\ \text{3} & \text{1.50} & \text{4.50}\\ \text{6} & \text{3.00} & \text{5.00}\\ \text{Bumblebee} & \text{6.4} & \text{130}\\ \end{matrix}$$

How many different 7 -digit phone numbers can have the digits 7, 3, 5, 2, 7, 3 and 2?

Place the following types of electromagnetic radiation in order of decreasing wavelengths: FM radio station, red color in neon lights, and cell phone.

Out of 17 contacts in her cell phone, how many different ways can Shana set the first four speed-dial contacts?