A recent study found that 42% of all Americans support stricter environmental regulations. Let x be the number of Americans who support stricter environmental regulations out of a random sample of 37 Americans. Note: this is a binomial experiment. The mean of the probability distribution of x is: 12.45 021.46 15.54 03 The standard deviation of the probability distribution of x is: 03 15.54 09.01 0.85