Answer: A portfolio containing 30 randomly selected stocks will have the smallest standard deviation.
Explanation:
A portfolio containing 30 randomly selected stocks tend to have a lesser covariance between the security returns. Also, there will be increased diversification. This increased diversification lowers the risk of portfolio thereby resulting in a lower standard deviation.
Other options are not correct. A portfolio consisting of 30 energy stocks will have a higher level of covariance between the security returns. Therefore, the standard deviation is lower.
A coefficient of variance greater than one will have a high level of variance while a coefficient variance less than 1 has a lower level of variance. A lesser covariance will result to a lower standard deviation and vice-versa.
Answer:
I have solved part a) because question contains only part a) however it has 3 more parts as well but that are not mentioned in the question. Part a) is explained below.
Explanation:
a) The distribution should be right skewed as most of the numbers lies at that side while using the median to correctly represent an observation in the distribution.
To represent the variability of the observations, interquartile range could be used. Since, there is a good number of expensive houses and this would increase the mean and standard deviation. So, it is better to use interquartile range to represent it, i.e. upper quartile for expensive houses, and lower quartile for less expensive houses and middle quartile for mid-range priced houses.
The price of the water needs to be raised by 40% when the consumption of water reduces by 10% and the price elasticity of demand results to 25%.
<h3>What is meant by the price of elasticity of demand?</h3>
The price elasticity of demand is determined as the proportionate variation in quantity with respect to variation in the price of a good.
Given values:
Change in water consumption (fall): 10%
Price elasticity of demand: 25%
Computation of percentage change in the price of water:

Therefore, there is an increase in water price by 40%.
Learn more about the price elasticity of demand here:
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Answer: Market Economy
Explanation:
A country in which the economic decisions are majorly controlled by individuals or private companies is a market economy.
A market economy is an economic system where there is very little government interference which is in the form of regulations, the economy is controlled mainly by private individuals and production is determined by the forces of demand and supply.