According to a certain website, wine critics generally use a wine-scoring scale to communicate their opinions on the relative quality of wines. Wine scores range from 0 to 100, with a score of 95-100 indicating a great wine, 90-94 indicating an outstanding wine, 85-89 indicating a very good wine, 80-84 indicating a good wine, 75-79 indicating a mediocre wine, and below 75 indicating that the wine is not recommended. Random ratings of a pinot noir recently produced by a newly established vineyard in 2018 follow:

87	91	86	82	72	91
60	77	80	79	83	96

Develop a point estimate of the standard deviation for wine scores received by this pinot noir. (Round your answer to four decimal places.) ________