A. How many grams of lithium nitrate, LiNO3 (68.9 g/mol), are required to prepare 342.6 mL of a 0.783 M LiNO3 solution? B. What mass of H3PO4 (98.0 g/mol) is present in 36.2 L of a 0.0827 M solution of H3PO4? C. The formula mass of zinc acetate trihydrate, Zn(CH3COO)2 • 3H2O, is ? D. A 2.39-g sample of an oxide of chromium contains 1.48 g of chromium. Calculate the simplest formula for the compound E. The analysis of an organic compound showed that it contained 1.386 mol of C, 0.0660 mol of H, 0.924 mol of O, and 0.462 mol of N. How many nitrogen atoms are there in the empirical formula for this compound? Thanks

The following table shows the approximate number of males of Hispanic origin employed in the United States in a certain year, broken down by age group. Age 15-24.9 25-54.9 55-64.9 Employment (thousands) 29,000 17,000 3,700 (a) Use the rounded midpoints of the given measurement classes to compute the expected value and the standard deviation of the age X of a male Hispanic worker in the United States. (Round all probabilities and intermediate calculations to two decimal places.) expected value yrs old standard deviation yr (b) In what age interval does the empirical rule predict that 68 percent of all male Hispanic workers will fall? (Round answers to the nearest year.) ,

The question was:

Finals are over and the marks are in. For all the students who have completed the introductory course to business statistics the distribution of the grades represented a bell-shaped distribution, symmetrical about the average which was 75.90 marks. The standard deviation was 1.40.

Given the information above, answer the following questions using the Empirical Rule.

For full marks your answer should be accurate to at least two decimal places.

a) Approximately what percentage of marks were above 77.30?

b) Approximately what percentage of marks were below 71.70?

c) Approximately what percentage of marks were between 71.70 and 80.10?

I don't want to get answers, I want method steps，Thanks!

The mean value of land and buildings per acre from a sample of farms is ​$1300​, with a standard deviation of ​$100. The data set has a​ bell-shaped distribution. Assume the number of farms in the sample is 77. ​(a) Use the empirical rule to estimate the number of farms whose land and building values per acre are between ​$1200 and ​$1400. nothing farms ​(Round to the nearest whole number as​ needed.) ​(b) If 22 additional farms were​ sampled, about how many of these additional farms would you expect to have land and building values between ​$1200 per acre and ​$1400 per​ acre? nothing farms out of 22 ​(Round to the nearest whole number as​ needed.)

Write the complete redox and the two half-reactions for the reaction of aluminum and copper. Which species is oxidizing agent? The reducing agent? How many electrons were transferred?

A compound containing xenon and fluorine, Xex,Fy, was produced by shining bright sunlight on a gaseous mixture of 0.439 g of Xe and excess fluorine. If all the xenon reacts, and 0.693 grams of the compound are formed, what is the empirical formula of the compound?

A 0.158 gram sample of a salt, comprised of barium and one of the halide ions, was dissolved in water, and an excess of sulfuric acid was added to form barium sulfate, BaSO4. After filtering and drying, the solid BaSO4 weighed 0.124 grams. Determine the identity of the halide and the formula of the barium halide.

The true percentage of left-handed people is 13% (p = .13)

1) a. If we survey two hundred people, how many left handers do you expect to survey?

b. If you repeat this survey, will you always get this number of left-handers (the
expectation)? Why or why not?

c. What is the spread (standard deviation) of the sample proportions?

d. Use the empirical rule to describe where we expect sample proportions to lie if we
repeated this survey (with size of 200 people) over and over again

68% of sample proportions would lie between ______________and _____________

95% of sample proportions would lie between _____________and______________

99.7% of sample proportions would lie between _____________and______________

• Hypothesis testing is a set of core analysis tools used to answer questions about the characteristics of a population. The process involves a number of steps, varying from five to ten depending upon the author of the text being used. What are these steps and why is it so important to follow and explicitly state each step in the process? In your responses discuss the properties of hypotheses, the importance and meaning of the level of significance and the various kinds of tests we might choose from and why.
• One and Two sample hypothesis tests (see week five for the two sample tests) are either comparing a sample to a standard value or comparing to samples to each other. Thanks to the CLT and the empirical rule we can usually trust the results

• Hypothesis testing is a set of core analysis tools used to answer questions about the characteristics of a population. The process involves a number of steps, varying from five to ten depending upon the author of the text being used. What are these steps and why is it so important to follow and explicitly state each step in the process? In your responses discuss the properties of hypotheses, the importance and meaning of the level of significance and the various kinds of tests we might choose from and why.
• One and Two sample hypothesis tests (see week five for the two sample tests) are either comparing a sample to a standard value or comparing to samples to each other. Thanks to the CLT and the empirical rule we can usually trust the results

Consider a population of 1024 mutual funds that primarily invest in large companies. You have determined that μ​, the mean​ one-year total percentage return achieved by all the​ funds, is 9.70 and that σ​, the standard​ deviation, is 1.75. Complete​ (a) through​ (c).

a. According to the empirical​ rule, what percentage of these funds is expected to be within ±3 standard deviations of the​ mean?

b. According to the Chebyshev​ rule, what percentage of these funds are expected to be within ±2 standard deviations of the​ mean ​(Round to two decimal places as​ needed.)

c. According to the Chebyshev​ rule, at least 88.89% of these funds are expected to have​ one-year total returns between what two​ amounts? ​(Round to two decimal places as​ needed.)