1. A student earned grades of 84, 78, 84, and 72 on her four regular tests. She earned a grade of 78 on the final exam and 86 on her class projects. Her combined homework grade was 87. The four regular tests count for 40% of the course grade, the final exam counts for 30%, the project counts for 10%, and homework counts for 20%. What is her weighted mean grade? (Round to one decimal place.)

The histogram below describes the length of 48 fish caught by guests on Ray's Fishing Charter boat last season. What percentage of fish were less than 46 inches long? (Round to the nearest whole number percentage and enter ONLY the numerical answer, for example enter 56 for 56%.) Length of fish caught Frequency 12 10 6+ 4: 21 40 43 46 49 52 55 58 .docx Practice Pro....docx

Suppose that X, Y, and Z are jointly distributed random variables, that is, they are defined on the same sample space. Suppose that we also have the following. E(X)=-9 E (Z) = 1 E (Y)=-6 Var(Y)=28 Var(Z) = 47 Var (X)=44 Compute the values of the expressions below. E (2-Z) = 0 E(X+32)=0 -5 -2-Var(4X) = 0 E(-x²) = 0 Continue □ X S M 31 Ⓒ2022 McGraw Hill LLC. All Rights Reserved

10.