1. (4) Use the formulas to find the population variance and the population standard deviation. Population: 3 6 10 12 14 2. (3) The following data represent the amount of time (in minutes) a random sample of eight students took to complete the online portion of an exam. Compute the range, sample variance, and sample standard deviation (use the calculator functions). 60.5 128.0 84.6 122.3 78.9 94.7 85.9 89.9 Range: ________________ Sample Variance: _____________ Sample standard deviation: ______________ 3. (3) SAT Math scores have a bell-shaped distribution with a mean of 515 and a standard deviation of 114. a. What percent of SAT scores is between 401 and 629? b. What percentage of SAT scores is greater than 743?

1. The following frequency distribution represents the birth weight of all babies born in the U.S. in 2017 Weight (Grams) Number of Babies Midpoints 0 - 999 25,446 1000 - 1999 91,375 2000 - 2999 924,163 3000 - 3999 2,513,786 4000 - 4999 296,874 5000 - 5999 4241 a. (2) Calculator the class midpoint for each class (fill answers on the above table). b. (4) Approximate the mean and standard deviation birth weight (use the TI calculator functions) Mean: _______________ Standard deviation: __________________ 2. (4) In Melanie's calculus class, attendance counts for 5% of the grade, quizzes count for 10% of the grade, exams count for 60% of the grade, and the final exam counts for 25% of the grade. Melanie had a 100% average for attendance, 93% for quizzes, 86% for exams, and 85% on the final. Determine Melanie's course average.

through explanation please