Champ

The reagent has a MW of 32.6 g/mol.

Express the prepared reagent in molarity?

Thank you...

Express this as molarity.

MW of NaCl is 58.44 g/mol. Express this result in M, μM, and nM values...

Thanks in advance

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A buffer needs to be prepared at a 1M concentration of Compound X. The MW of compound X is 86.4g/mol. What amount of compound X is required to prepare a 100mL volume of solution?

Part 2)

This has 92.5% Purity. What volume is required to prepare 10 mL at a concentration of 100 μg/mL ?

Thanks in advance.

Very confused.

Any help will be much appreciated.

I'm sure this is quite simple, however this has been confusing me for a while.

Any suggestions?

Any help will be appreciated.

Thanks in advance

This seems quite straightforward however it has been troubling me for a while.

Im not too sure what method to use and would appreciate any help given.

Many Thanks

f(t) = 1

g(t) = sin(at)

I am totally and utterly confused, any help would be appreciated.

Thanks in advance

Question 1:

A person has a portfolio of 4 shares.

The price and quantity of shares held between 2006 and 2010 are as follows:

2006 2006 2010 2010

Share Price no. held Price no. held

A 293 256 200 180

B 350 650 265 250

C 105 600 140 400

D 50 100 159 200

Give your answers to 2 decimal places

(a) What is the base-weighted (Laspeyres) price index? 4 marks

(b) What is the current-weighted (Paasche) price index? 4 marks

Question 2:

The price of a house in a residential district fell from £534 000 in 2008 to £301 000 in 2010.

The average RPI in 2008 was 214.8 and in 2010 was 223.6.

By deflating the 2010 price to 2008 prices state the real drop in price? 4 marks

Question 3:

An employee of a company receives an index-linked salary of £41 000 for 2006.

Assuming the average value of the RPI for 2006 was 193.4 and for 2010 was 223.6,

what is the employee's salary for 2010? 4 marks

Question 4: The following data refers to monthly demand for a certain product:

MONTH 1 2 3 4 5

DEMAND 178 180 156 150

Give your answers to 2 decimal places

(a) Use exponential smoothing with α value of 0.2 to obtain a forecast for month 6

(b) Calculate the MAD statistic for this α value

(c) Calculate the MSE statistic for this α value

Question 2:

The price of a house in a residential district fell from £534 000 in 2008 to £301 000 in 2010.

The average RPI in 2008 was 214.8 and in 2010 was 223.6.

By deflating the 2010 price to 2008 prices state the real drop in price?

A person has a portfolio of 4 shares.

The price and quantity of shares held between 2006 and 2010 are as follows:

2006 2006 2010 2010

Share Price no. held Price no. held

A 293 256 200 180

B 350 650 265 250

C 105 600 140 400

D 50 100 159 200

Give your answers to 2 decimal places

(a) What is the base-weighted (Laspeyres) price index? 4 marks

(b) What is the current-weighted (Paasche) price index? 4 marks

A bank is reviewing its service charges and interest-paying policies on personal current accounts.The average daily balance on personal current accounts held at the bank is £386 with a standard deviation of £72. In addition, the balances were found to be normally distributed. Give your answers to 2 decimal places

(a) What percentage of the bank's customers have average daily balances in excess of £400?

(b) What percentage of the bank's customers have average daily balances below £200?

(c) What percentage of the bank's customers have average daily balances between £150 and £350?

(d) the bank is considering paying interest to customers with average daily balances in excess of a certain amount. If the bank does not wish to pay interest to more than 5% of its customers , what is the minimum average daily balance it should be willing to pay interest on?

A car- hire firm has 8 cars which it rents out by the day. The number of demands for a car each day has a Poisson distribution with mean equal to 7 and the charge for hire is a flat rate (irrespective of mileage) of £23. Giving your answers to 2 decimal places, what is the probability that on a particular day

(a) the demand for cars exceeds the number of cars available for hire?

(b)Four cars are hired?

(c) between 4 to 6 cars inclusive are hired?

(d) Determine the average daily income of the firm.

Thanks !

In regards to hypothesis testing?

In a lottery, the chance of losing for a single entry is 97%. A gambler placed a single entry once every week for 100weeks.

1) Find probability that gambler lost on fewer than 97 weeks?

2) Find probability that gambler lost on more than 95 weeks?

The answer in mark scheme for 1 is 0.3528 and for 2 is 0.8179 however I dont know how to get these answers...HELP !

Thanks in advance

Explain why with reference to stem and leaf and box plot?

I recently asked this question but it couldnt be answered because of lack of info, so ive tried to rewrite this,

Bottles of water are labelled as being 750g in weight. If the actual weights of the bottles are normally distributed with mean 760g and s.d of 5g.

1) Bottles of water are delivered in boxes of 100 bottles. What is probability that a randomly chosen box of 100 bottles will weigh less than 75kg(75000g)?

2) What is the probability than none of the 100 bottles in a randomly chosen box will weigh less than 750g?

3) If B is number of bottles in a randomly chosen box that weighs less than 750g, what is the expected value(mean) of B and its variance ?

I have no idea how to work this out however the mark scheme says the answers to either 1 or 2 is (1-0.02275)^100 = 0.1

and answer to c is mean = 2.275, variance = 2.223

Im confused, dont know how to get these answers...HELP :( !

Thanks in advance

Normal Distribution Question - Very difficult ?

Bottles of water are labelled as being 750g in weight. The actual weight of boxes are normally distributed with mean 760g and s.d of 5g.

1) Bottles of water are delivered in boxes of 100. What is probability that a randomly chosen box will weigh less than 75kg(75000g)?

2) What is the probability than none of the 100 packets in a randomly chosen box will weigh less than 750g?

3) If B is number of bottles in a randomly chosen box than weighs less than 750g, what is the expected value(mean) of B and its variance ?

Thanks in advance

Im sorry if asked before, however the last answer given was not correct nor was it completely answered !

Bottles of water are labelled as being 750g in weight. The actual weight of boxes are normally distributed with mean 760g and s.d of 5g.

1) Bottles of water are delivered in boxes of 100. What is probability that a randomly chosen box will weigh less than 75kg(75000g)?

2) What is the probability than none of the 100 packets in a randomly chosen box will weigh less than 750g?

3) If B is number of bottles in a randomly chosen box than weighs less than 750g, what is the expected value(mean) of B and its variance ?

Thanks in advance

1) Best Rap Album

2pac - All Eyez on me

2) Best Rap Song

Ice Cube - Today was a good day

3) Best Rapper

Eminem.