Im unable to code this properly I provide my code in hopes it revised. Test Failed!

Expected Output:

The mean is $49\mathrm{.}325$

The standard deviation is $28\mathrm{.}58491422623691$

Actual Output:

The mean is $48\mathrm{.}893$

The standard deviation is $28\mathrm{.}24409114637404$

at junit.framework.Assert.fail:$57($Assert$.$java$)$

at junit.framework.TestCase.fail:$223($TestCase$.$java$)$

at tests.HW$4$Test.test$1$:$50($HW$4$Test.java$)$