You have gathered the following information on your investments. What is the expected return on the portfolio? Stock Number of S
1 answer:
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Answer:
And we can find this probability using the normal standard distribution table or excel and we got:
Explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the expected return, and for this case we know the distribution for X is given by:
Where and
We are interested on this probability
And the best way to solve this problem is using the normal standard distribution and the z score given by:
If we apply this formula to our probability we got this:
And we can find this probability using the normal standard distribution table or excel and we got:
Answer:
(i) Option (A) is correct.
(ii) Option (A) is correct.
Explanation:
(i) Marginal revenue refers to the change in total revenue obtained from the sale of an extra unit of a commodity. It is calculated by differentiating total revenue with respect to output. It is shown as:
where,
TR = Total revenue
q = output
(ii) In a perfectly competitive market, price is equal to both average revenue and marginal revenue. Since, firms in a competitive market are not required to reduce the price of their product for selling more number of units. Hence, the average revenue remains the same at all the level of output. That's why average revenue in equal to the price under perfect market conditions.
Therefore, every additional unit of an output is sold at a same price, so the marginal revenue obtained from an extra unit is constant and hence, price is equal to the marginal revenue.