in order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. the mean of the sample is determined to be 23. the number of degrees of freedom for reading the t value is

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76