Let p: The whole has one digit. Let q: The whole is less than 10. Which represents "The whole number has one digit if and only if the whole number is less than 10"?

p V q
p ^ q
p -> q
p <-> q

The third and fourth one are meant to be arrows but I can’t find the arrow on my phone just in case if anybody’s wondering what they are

Cor d? ? me ? max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.