Agroup of statistics students decided to conduct a survey at their university to estimate the average (mean) amount of time students spent studying per week. they sampled 554 students and found a mean of 22.3 hours per week. assuming a population standard deviation of six hours, what is the 95% level of confidence?

Jessa bought a yoyo from a company that claims that, with each retraction, the string rolls up by 60% of the original length. she sets up a tape measure and throws the yoyo 3 times. her data are charted below. throw length of string (feet) 1 3 2 1.8 3 1.08 jessa wants to find the sum of the length of string after 10 throws. what is the sum of the lengths, rounded to the nearest hundredth?