Q1 to 4 only need correct option ..no explanation so send me ASAP thanks

l .The sum of the relative frequencies for all classes will always equal A. the sample size B. the number of classes C. one D. any value larger than one 2. The numerical value of the standard deviation can never be A. larger than the variance B. zero C. negative D. smaller than the variance 3. A negative value of Z indicates that A. the number of standard deviations of an observation is to the right of the mean B. the number of standard deviations of an observation is to the left of the mean C. a mistake has been made in computations, since Z cannot be negative D. the data has a negative mean 4. If P(A)=0.T, P(B)=0.6, then events A and B are . A. not mutually exclusive. B. mutually exclusive. C. independent events. D. complements of each other