The graph illustrates a normal distribution for the prices paid for a particular model of HD television. The mean price paid is $1000, and the standard deviation is $60.                         Distribution of Prices a) What is the approximate percentage of buyers who paid between $880 and $1060? b) What is the approximate percentage of buyers who paid less than $940? c) What is the approximate percentage of buyers who paid more than $1120?

The number of cars per household in a certain neighborhood varies from 1 to 6. The probability distribution of the number of cars owned by a random household,  is as follows: (Round answers to 2 decimals)  x P(x) 0 0.05 1 0.11 2 0.17 3 0.3 4 0.2 5 0.14 6 0.03 Use the above probability distribution table to find the following: a)

Twilight Cineplex, a local movie theater, offers a special “Movie Combo Deal”. Customers choose one of two different snacks: either nachos or candy, and also select a beverage of either a cherry Icee, a milkshake, or a fruit smoothie. The table below summarizes the number of customers who selected each option during a recent movie screening: Nachos Candy Totals Cherry Icee 8 23 31 Milkshake  13 14 27 Fruit smoothie 11 10 21 Totals 32 47 79 a) What is the probability that a randomly selected customer ordered a cherry Icee given that they ordered nachos? b) What is the probability that a randomly selected customer ordered a milkshake or candy?  c) What is the probability that a randomly selected customer ordered a cherry Icee or a fruit smoothie?

A randomly selected group of individuals were asked how many marbles they believed were contained in a sealed jar. The following frequency distribution summarizes the results. a) Complete the table by determining the midpoints, relative frequencies, and cumulative frequencies.  Marbles Frequency Midpoints  Relative Frequency Cumulative Frequency 220 – 232 6 233 – 245 7 246 – 258 10 259 – 271 5 272 – 284 11 b) Find the mean of the frequency distribution. c) Draw a histogram of the frequency distribution. 

List the number of atoms for the following formula. NaNO3   Give your answer in the following format – for example if the formula is  MgCl2     –  answer like this   1Mg 2Cl  

               2Al   +   Fe2O3   ——>  Al2O3  +  2Fe Use the chemical equation above to calculate the number of grams of  Al2O3  produced from 2.25 mol of Al.   You only need to put in the answer – I do not need to see your calculations that you did to get the answer. Also be sure to add the units to your answer – which on this problem will be just g.

Balance the following chemical equation. Na   +  Al(NO3)3  ——> NaNO3   +  Al   Give your answer in the following format – for example if the answer to a balanced equation is  C3H8   + 5O2 —–> 3CO2  + 4H2O  –  then answer like this:       5O2  3CO2  3CO2  4H2O  I don’t need you to write down the compounds that do not have a number in front of them.

               C3H8   + 5O2 —–> 3CO2  + 4H2O Use the chemical equation above to calculate the number of grams of CO2 that will react with 3.0 mol of O2.   You only need to put in the answer – I do not need to see your calculations that you did to get the answer. Also be sure to add the units to your answer – which on this problem will be just g.

Calculate the molar mass of potassium chloride, KCl. You only need to put in the answer – I do not need to see your calculations that you did to get the answer. Also be sure to add the units to your answer – which on this problem will be  g/mol.

Calculate the molar mass of sodium bromide, NaBr. You only need to put in the answer – I do not need to see your calculations that you did to get the answer. Also be sure to add the units to your answer – which on this problem will be  g/mol.