Added standard deviation function with example in app and test in tests

ameerthehacker / node-calculator

A simple app for automated tests using jest

MIT License

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Closed OsamaNabih closed 5 years ago

OsamaNabih commented 5 years ago

Also noticed the sqrt test was failing so I fixed it by changing return 'Undefined' to throw 'Undefined' so the test passes

ameerthehacker commented 5 years ago

cool thanks for the contribution