An entrepreneur in a developing country owns 10 food carts. he has ten employees to work with these food carts. let xi be a random variable representing revenue from cart i (on a particular day), i = 10. xi is approximately normally distributed with mean $35, and variance 64 (squared dollars). revenues of the different carts are independent. what is the probability that cart i will generate revenue less than $30 on a particular day? fz is the cumulative distribution function of the standard normal random variable. a. fz(0.625) b. fz(– 0.625) c. fz(0.375) d. fz (– 0.375)