In a survey, 13 people were asked how much they spent on their child's last birthday gift. The results were roughly shaped as a normal curve with a mean of $40 and standard deviation of $18. Construct a confidence interval at a 98% confidence level. Give your answers to one decimal place.

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Which graph shows the solution to the system of linear inequalities? y-4t< 4 y