g Many buildings are constructed with an estimated useful life of 50 years. You look through records of 9 random buildings and find a mean number of useful years of 47 with a standard deviation of 6. What is the UPPER BOUND of the 99% confidence interval (two-sided) for the mean number of useful years of these buildings

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Students at a high school were asked about their favorite outdoor activity. the results are shown in the two-way frequency table below. fishing camping canoeing skiing total boys 36 44 13 25 118 girls 34 37 22 20 113 total 70 81 35 45 231 select all the statements that are true based on the given table. more girls chose camping as their favorite outdoor activity than boys. more girls chose canoeing as their favorite outdoor activity than those who chose skiing. more boys chose skiing as their favorite outdoor activity than girls. there were more boys surveyed than girls. twice as many students chose canoeing as their favorite outdoor activity than those who chose fishing. more students chose camping as their favorite outdoor activity than the combined number of students who chose canoeing or skiing.