A painter is mixing red and white paint to make a pink color. The ratio of red paint to pink paint is 1:4. What is the ratio of red paint to white paint? 1:3
3:1
4:1
1:4
3:4

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?