Helloo, pl i need help asap on this question

Josh and his sister Megan run together each morning and do not use a stopwatch to keep track of their time Josh thinks they usually run the mile under 7 minutes , while Megan thinks it takes them longer. They borrow a stopwatch and time themselves each day for 20 days. Their mean time to run one mile is minutes with a standard deviation of minutes. Test Megan's hypothesis at 10% significance