Chapter 11 Data Analysis and Statistics - 11.2 Apply Transformations to Data - 11.2 Exercises - Mixed Review - Page 755: 37

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The probability of tossing a coin 30 times and getting 18 heads can be found by applying: $P(X=18)=_nC_k p^k (1-p)^{n-k}\\=_{30} C_{18} 0.5^{18}(1-0.5)^{30-18}\\=\frac{30!}{(30-18)!.18!}\times0.5 ^{30}\\=0.08055$