The following stem-and-leaf diagram represents the Stanford-Binet IQ scores of students in a college statistics course:
Key: 15 | 1 = 151
10| 7 8 8 8 9 9
11| 0 0 0 1 2 2 3 5 5 6 8 9
12| 0 2 3 5
13| 2 4
14| 5
15| 1
Given that the sample mean is x = 117.77 and the sample standard deviation is s = 11.50, determine how many sample standard deviations the score 151 is from the sample mean.