Given the following grouped frequency distribution

Find the mean (give you answer to one decimal) =

Find the standard deviation (give your answer to two decimals) =

What is the shape of this distribution?

A random sample of 250 smartphone users is selected. They are asked to state their gender as well as the operating system of the smartphone they possessed at the moment. The resulting frequencies are shown below

At 1% level of significance, use a Chi-square test to determine whether there is any evidence to reveal that gender and the choice of the smartphone’s operating system are independent.

) Consider the following values representing the age of group of 31 adults: 75, 90, 60, 95, 85, 84, 76, 74, 92, 62, 83, 80, 90, 65, 72, 79, 36, 78, 65, 98, 70, 88, 99, 60, 82, 65, 79, 76, 80, 52, 75
a) Create a five-number summary for these ages.

b) Create a boxplot using the five-number summary from part (a).

A class consisting of 10 students takes a test. The scores are approximately normally distributed with a mean of 74 and a standard deviation of 11. The teacher wants to curve the grades in the following manner: the top 5% get As, the next highest 12% get Bs, the bottom 5% get Fs, and the next lowest 12% get Ds. The rest will get Cs. Find the Z-scores for each line and the test score corresponding to each z score

Previous Question:

The mean store for an exit text at an urban high school examination was 68% with a standard deviation of 3. Given these results, what percentage of students fall under the mean?

25%

50%

60%

75%

Using the same data from the question above, what scores will fall within one standard deviation above and one standard deviation below the mean?

An article describes an experiment to determine the effectiveness of mushroom compost in removing petroleum contaminants from soil. Out of 155 seeds planted in soil containing 3% mushroom compost by weight, 74 germinated. Out of 155 seeds planted in soil containing 5% mushroom compost by weight, 86 germinated. Can you conclude that the proportion of seeds that germinate differs with the percent of mushroom compost in the soil? Find the P-value and state a conclusion.

Please fill out the charts below with the given information.

The following selected transactions were completed by Amsterdam Supply Co., which sells office supplies primarily to wholesalers and occasionally to retail customers. Also note that the company uses a clearing house to take care of all bank as well as non-bank credit cards used by its customers.

Record on page 10 of the journal

Mar.      2              Sold merchandise on account to Equinox Co., $18,900, terms FOB destination, 1/10, n/30. The cost of the merchandise sold was $13,300.

3              Sold merchandise for $11,350 plus 6% sales tax to retail cash customers. The cost of merchandise sold was $7,000.

4              Sold merchandise on account to Empire Co., $55,400, terms FOB shipping point, n/eom. The cost of merchandise sold was $33,200.

5              Sold merchandise for $30,000 plus 6% sales tax to retail customers who used MasterCard. The cost of merchandise sold was $19,400.

12           Received check for amount due from Equinox Co. for sale on March 2.

14           Sold merchandise to customers who used American Express cards, $13,700. The cost of merchandise sold was $8,350.

16           Sold merchandise on account to Targhee Co., $27,500, terms FOB shipping point, 1/10, n/30. The cost of merchandise sold was $16,000.

18           Issued credit memo for $4,800 to Targhee Co. for merchandise returned from sale on March 16. The cost of the merchandise returned was $2,900.

Record on page 11 of the journal

Mar.      19           Sold merchandise on account to Vista Co., $8,250, terms FOB shipping point, 2/10, n/30. The cost of merchandise sold was $5,000. In addition, Amsterdam Supply Co. immediately paid $75 in freight charges and added this to the invoice sent.

26           Received check for amount due from Targhee Co. for sale on March 16 less credit memo of March 18.

28           Received check for amount due from Vista Co. for sale of March 19.

31           Received check for amount due from Empire Co. for sale of March 4.

31           Paid Fleetwood Delivery Service $5,600 for merchandise delivered during March to customers under shipping terms of FOB destination.

Apr.       3              Paid City Bank $940 for service fees for handling MasterCard and American Express sales during March.

15           Paid $6,544 to state sales tax division for taxes owed on sales.

Journalize the entries to record the transactions of Amsterdam Supply Co. Refer to the Chart of Accounts for exact wording of account titles.

Journalize the entries to record the transactions of Amsterdam Supply Co. Refer to the Chart of Accounts for exact wording of account titles. Scroll down for page 11 of the journal.

2. Every day, Chung-Li buys a scratch-off lottery ticket with a 40% chance of winning some prize. He noticed that whenever he wears his red shirt he usually wins. He decided to keep track of his winnings while wearing the shirt and found that he won 6 out of 9 times.

• Let's test the null hypothesis that Chung-Li's chance of winning while wearing the shirt is 40% as always versus the alternative that the chance is somehow greater.
• The table at right sums up the results of 1000 simulations, each simulating 9 lotteries with a 40%, percent chance of winning.
• According to the simulations, what is the probability of winning 6 times or more out of 9?
• 74/1000 = .00074
• Let's agree that if the observed outcome has a probability less than 1% under the tested hypothesis, we will reject the hypothesis.
• What should we conclude regarding the hypothesis?
  • We cannot reject the null hypothesis.
  • We should reject the null hypothesis.

Determine the missing %abundance and mass of two isotope of Selenium given the atomic mass of Selenium from the periodic table and the other stable isotopes of Selenium that have the following %abundances and masses: (7 points)

      Isotope                                Isotope mass (amu)            %abundance                   

74Se 73.922477 ??????

76Se 75.919214 9.38

77Se 76.919915 7.63

78Se 77.917310 23.77

80Se 79.916522 49.61

82Se ???????? 8.73

b) Calculate the missing information for the isotopes of Selenium listed in Part A (Question 22) (5 points)

c) Germanium has a melting of 428^oF

I. Calculate the melting point in Kelvin. (2 points)

II. If a sample of Germanium has a temperature 100 K higher than this melting point (K), what is the physical state (solid, liquid, or gas) of the germanium sample? (1 point)

III. Calculate the boiling point of Selenium (in K) if 2.269 x 10⁶ J of heat is needed to warm 20.0 kg of Selenium in Part II (Question#22), just to the boiling point. (sp Heat = 0.31 J/(g*^oC)) (5 points)

Use the following information for questions 1-5:

The Absorption Costing Unit Product Cost is:

$100.20

$105.50

$74

$70

The Variable Costing Unit Product Cost is:

$70

$74

$105.50

$100.20

If 6,000 units are sold during the period, total period cost under variable costing would be:

$188,100

$396,000

$422,400

$420,000

If 6,000 units are sold during the period, total period cost under absorption costing would be:

$188,100

$185,700

$234,300

$422,400

If 6,000 units are sold during the period, net income under the absorption costing approach will be:

$15,750 lower than net income under the variable costing approach

$15,750 higher than net income under the variable costing approach

$21,300 higher than net income under the variable costing approach

$21,300 lower than net income under the variable costing approach