One indicator of an outlier is that an observation is more than 2.5 standard deviations from the mean. If a data set has mean 80 and standard deviation 3, is 90 a suspect outlier?

For how answer my question this will be the last question can you answer in math subject

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

The water aquarium shark tank is always greater than 25 feet of the water level decreased by 6 feet during cleaning what was the water level before the cleaners took out any water