A company warranties its laptop computers. Every defective laptop costs the company $200 in repair costs. The company estimates that 10% of all laptops sold will require warranty repair. If 20 laptops are sold, then a) What is the expected number needing repair? It is b) What are the expected warranty costs? It is s b) What is the variance of the number of laptops (X) needing warranty repair? It is c) What is the standard deviation of cost (Y) to the company of warranty repair? it is dollars. Note: We can model the problem as X=#of computers needing repair Y cost of the warranty repair Y=$200X

Diagonalize the matrices in Exercises 7-20, if possible. The roul eigenvalues for Exercises 11-16 and 18 are included below the matrix.

4.(-12)

7 3/5 + 2/3