One pump can empty the pool in 36 hours. the second pump is twice faster. after both pumps, working together emptied 1 3 of a pool the second pump broke. the first pump finished the job. how long did it take to empty the pool?

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.