The amounts of electricity bills for all households in a particular city have an approximately normal distribution

Question:

The amounts of electricity bills for all households in a particular city have an approximately normal with a mean of $140 and a standard deviation of $30. Let x̅ be the mean amount of electricity bills for a random sample of 25 households selected from this city. Find the mean and standard deviation of x̅, and comment on the shape of its sampling Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...