The mean of a data set is $400 and the standard deviation is $40. according to chebyshev's theorem, what percent of the values will lie within plus or minus 1.6 standard deviations of the mean?

Rewrite the hyperbolic equation 4y^2 -9x^2 +54x-8y-113=0

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?

The expression 1.01*1.005(^t) gives the amount of money, in thousands of dollars, in carter's savings account (t) years after he opens it. what does 1.01 represent in this expression?