x 4 5 6 7 8 P(X=x) 0.2 0.3 0.1 0.2 0.2 Find the standard deviation. Round your answer to one decimal place.
Added by Samuel J.
Step 1
E(X) = (4 × 0.2) + (5 × 0.3) + (6 × 0.1) + (7 × 0.2) + (8 × 0.2) = 0.8 + 1.5 + 0.6 + 1.4 + 1.6 = 5.9 Show more…
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