Please explain to me the process on how to get these answers? What formula? What is the topic on this please explain and provide full solution. Thanks.

QUESTION GROUP F deviation $2.50 Americans spend a lot of money on fast food. A study showed that the amount spent per year is over $1200, and that the amount per meal is normally distributed with mean $12.50 per meal and standard . What is the probability that a randomly selected meal will cost at least $14.50? o Answer: [a] (round your answer to 4 decimal places, e.g., 0.1234) . What is the minimum cost of the most costly 5% of all meals? o Answer: $[b] (do not enter the $ sign; round your answer to 2 decimal places, e.g., xx. 12) . What proportion of meals are between $12.50 and $14.50? o Answer: [c] (round your answer to 4 decimal places, e.g., 0.1234) . What is the cost at the first quartile? o Answer: $[d] (do not enter the $ sign; round your answer to 2 decimal places, e.g., xx. 12) Suppose Canadians spend the same mean of $12.50 per meal, but with a different but unknown standard deviation. If we know that the probability of a randomly chosen meal exceeding $14.50 is 0.0548, what is the standard deviation? o Answer: $[e] (do not enter the $ sign; round your answer to 2 decimal places, e.g., xx. 12) Specified Answer for: a 0.2119 Specified Answer for: b 16.6121 Specified Answer for: c 0.2881 Specified Answer for: d @ 10.8125