Answer the problem and show your solution: You are planning to buy a cellphone with a good quality in order to attend the online class. The average price of 50 cellphones is Php13,500 with a margin of...

Answer the problem and show your solution:

You are planning to buy a cellphone with a good quality in order to attend the online class. The average price of 50 cellphones is Php13,500 with a margin of error of Php273.65 and a confidence level of 99%. Find the length of confidence interval