Look at the picture comparing the returns for Tesla (TSLA) and S&P 500 (^GSPC). It's obvious that the return volatility (i.e. standard deviation) of Tesla stock is at least 10 times greater (that's 1,000%!) than that of S&P 500.

Yet, if you look up Tesla's beta (on the summary page of Yahoo Finance) is only slightly more than one (1.2) suggesting that TSLA is only about 20% as volatile as the market. How do you explain this discrepancy between what standard deviation tells you (that TSLA is extremely risky) and what beta tells you (that the stock is just a little bit more risky than the market (SP500)?