A skin care company had 1,500 people try a new acne cream. Nine people had a mild reaction the formula is then improved and those 1,500 people try the new cream only 4

The percent decrease in number of allergic reactions is 55%

Step-by-step explanation:

Only 4 of them had a mild allergic reaction. What is the percent decrease in number of allergic reactions?

Percent of allergic people= Allergic people/ Total people * 100

                                         = 9/1500* 100

                                         = 0.6 %

IT means that out of 1000 people only 6 persons are allergic to the cream.

New Percent of allergic people= Allergic people/ Total people * 100

                                         = 4/1500* 100

                                         = 0.267 %

It means that out of 1000 people only 2.67 persons are allergic to the new improved cream.

Difference between Percentage = Old Percentage- New Percentage

                                                      = 0.6 %- 0.267%

                                                       =0.333%

Decrease= 0.333% = 0.333/100

In every thousand people 3.33 people are free of allergic reactions from those 6 allergic people.

Percentage Decrease= Decrease/ Total * 100

                        = 0.333/ 0.6 *100

                           = 0.55*100

                            = 55 %

The percent decrease in number of allergic reactions is 55%

the median here is 25. your lowest value is 14 and highest value is 48. to find the third quartile, find the medium number in between 25 and 48 which would be 42 i believe.