The average score for 100 teenage boys playing a certain computer game was 90,000 points per player. If the standard deviation of the population is 25,000 points, find the 90% confidence interval of the mean score for all teenage boys.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)