On a piano achievement test, the final score is made up of 65% performance, 30% sight reading, and 5% written theory.
john earned an average score of 75 on performance, 90 on sight reading, and 100 on written theory.
what was john's final score for the piano achievement test?
enter your answer as a decimal

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is