The number of cd's sold by daniel's discs for the last 6 days are given in the table. day day 1 day 2 day 3 day 4 day 5 day 6 cd's 15 10 10 10 18 15 find the mean of the number of discs sold over the six day period. find the standard deviation of the number of discs sold over the six day period. complete your work in the space provided or upload a file that can display math symbols if your work requires it. turn in all work associated with finding the mean and standard deviation.

Mean: 13

SD:

Step-by-step explanation:

To find the mean, you have to add up all of them and divide by the number of them. The sum is 30+30+18 or 78, and there are 6 so the mean is 78 / 6 = 13.

To find the standard deviation, we need to first find the distance from them to the mean. These are 2, 3, 3, 3, 5, and 2. Square these values to get 4, 9, 9, 9, 25, and 4. Now we have to take the mean of this, which is 8+27+25=35+25=60, so the mean is 10 and now we take the square root so the SD is .

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: