13.15 Let X have distribution N(0, 1). Let X1, ..., X30 be a random sample of X obtained by using Table 7. Compute P(X2 0.10) and compare this value with the relative frequency of that event.

Depth of Sapwood (in.) Frequency Depth of Sapwood (in.) Frequency 1.9 9399 1.0 2 1.3 29 3.7 4.0 123 82 1.6 62 4.3 48 106 4.6 27 2.2 153 4.9 14 2.5 186 5.2 5 2.8 193 5.5 1 3.1 188 3.4 151 Total frequencies: 1370