Claim: The mean systolic blood pressure of all healthy adults is less than 124 mm hg. Sample data: For 259 healthy adults, the mean systolic blood pressure level is 121.67 mm Hg and the standard deviation is 14.97 mm Hg. Complete parts (a) and (b). . . . a. Express the original claim in symbolic form. Let the parameter represent a value with respect to systolic blood pressure of a healthy adult. Type an integer or a decimal. Do not round.) b. Identify the null and alternative hypotheses. Type integers or decimals. Do not round.)