Aperson's systolic blood pressure, which is measured in millimeters of mercury (mm hg), depends on a person's age, in years. the equation:
p=0.005y^2−0.01y+121
gives a person's blood pressure, p, at age y years.
a.) find the systolic pressure, to the nearest tenth of a millimeter, for a person of age 48 years.
b.) if a person's systolic pressure is 133 mm hg, what is their age (rounded to the nearest whole year)?

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Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables