Find the expected value E(X)E(X) of the following data. Round your answer to one decimal place. x −6−6 −5−5 −4−4 −3−3 −2−2 P(X=x)P(X=x) 0.20.2 0.10.1 0.30.3 0.20.2 0.20.2

The data table below contains the amounts that a sample of nine customers spent for lunch (in dollars) at a fast-food restaurant. Complete parts (a) through (d). Click here to view page 1 of the table of critical values of t. Click here to view page 2 of the table of critical values of t. 4.28 5.03 5.75 6.51 7.39 7.43 8.38 8.46 9.71 Click to copy table. a. At the 0.05 level of significance, is there evidence that the mean amount spent for lunch is different from $6.50? State the null and alternative hypotheses. Ho: H (Type integers or decimals. Do not include the $ symbol in your answer.)

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Find the expected value E(X) of the following data. Round your answer to one decimal place. x 5 6 7 8 9 P(X = x) 0.2 0.2 0.1 0.2 0.3