Asmall school bus contains eight first-graders and ten second-graders. if two children are ill, what is the probability that at least one of them is a second-grader?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

Nine more than four times a number is the same as one less than twice the number. find the number?

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125