Claim: The mean systolic blood pressure of all healthy adults is less than 124 mm Hg. Sample data: For 286 healthy adults, the mean systolic blood pressure level is 123.89 mm Hg and the standard deviation is 16.07 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. Ho Hy : (Type integers or decimals. Do not round.)