Loretta, who turns eighty this year, has just learned about blood pressure problems in the elderly and is interested in how her blood pressure compares to those of her peers. Specifically, she is interested in her systolic blood pressure, which can be problematic among the elderly. She has uncovered an article in a scientific journal that reports that the mean systolic blood pressure measurement for women over seventyfive is of mmHg, with a standard deviation mmHg. (a) According to Chebyshev's theorem, at least 84% of the measurements lie between and . (Round your answer to 1 decimal place.) mmHg mmHg (b) According to Chebyshev's theorem, at least ?56%75%84%89% of the measurements lie between 121.5 mmHg and 147.1 mmHg