A school has found from past records that the average scores for boys is75in a sample of45boys and the average scores for girls is85in a sample of30girls. The population standard deviations for boys' and girls' scores were25 and17, respectively. The90%confidence interval for the difference of the population means is approximately (_____,2.022). Assume that the distributions of the scores of men and women are normally distributed. Round your answerto three decimal places.

Find upper bound.