The standard deviation of test scores on a certain achievement test is 10.5 . A random sample of 90 scores on this test had a mean of 72.1 . Based on this sample, find a 90% confidence interval for the true mean of all scores. What is the lower limit of the 90% confidence interval?

Find the arc length parameter along the given curve from the point where tequals=0 by evaluating the integral s(t)equals=integral from 0 to t startabsolutevalue bold v left parenthesis tau right parenthesis endabsolutevalue d tau∫0tv(τ) dτ. then find the length of the indicated portion of the curve r(t)equals=1010cosine tcost iplus+1010sine tsint jplus+88t k, where 0less than or equals≤tless than or equals≤startfraction pi over 3 endfraction π 3.

Afurniture store has 1,500 chairs in storage. a manager uses three delivery receipts to simulate samples to check 100 chairs and note the number of brown chairs. suppose the actual number of brown chairs is 1,080. about how many brown chairs are

Define multiplicative inverse. give an example of a number and its multiplicative inverse.