# Remember Standard deviation and percentages

We have found

68% = 1 SD

95% = 2 SD

99.7% = 3 SD

So these are:

68%, 95%, 99.7%

Or

68, 95, 99.7

To remember this ratio see the following:

Jay Z was **sick** and **late** (68%) which got him fired from his **nine** to **five** (95%) job, giving him **99** problems but **7up** (99.7%) wasn’t one.