Suppose that felisha is a librarian, and she read in a scholarly journal that the number of words in children's picture books published since 1950 is normally distributed with a mean of 802.2 words and a standard deviation of 92.0 words. she wishes to construct a confidence interval for the mean number of words in all children's picture books published after 2010, in case the number has changed in recent years. felisha took a random sample of 20 children's picture books published after 2010 and counted the number of words in all 20 books. her data is presented in the stem-and-leaf plot. 4 9 5 1 9 6 0 4 5 7 0 3 4 6 8 8 1 3 4 6 9 1 5 9 10 1 7 4951960457034688134691591017 leaf unit = 10 leaf unit=10 felisha calculated the mean of her sample to be 773.0 words, and now she wants to calculate the margin of error of a 99% confidence interval for the mean number of words in all books published after 2010. she assumes that the number of words in children's picture books published after 2010 has the same normal distribution and same standard deviation as the general population of all books published since 1950. compute the margin of error of a 99% confidence interval for the mean number of words in all children's picture books published after 2010. give your answer precise to one decimal pla
Answers
< xcy ≅ < xby
step-by-step explanation:
in δcax and δbax,
ac ≅ ab (given)< cax ≅ < bax (given)ax ≅ ax (common side)so, δcax ≅ δbax (side-angle-side or sas)
since δcax ≅ δbax, we can conclude < acx ≅ < abx
in δacy and δaby,
ac ≅ ab (given)< cay ≅ < bay (since < cax ≅ < bax is given and xy is the extension of line ax)ay ≅ ay (common side)so, δacy ≅ δaby (side-angle-side or sas)
since δacy ≅ δaby, we can conclude < acy ≅ < aby
now,
< acy ≅ < aby
=> < acx + < xcy ≅ < abx + < xby
=> < acx + < xcy ≅ < acx + < xby (since < acx ≅ < abx already proved above)
subtracting < acx from both sides, we get
< acx + < xcy -< acx ≅ < acx + < xby -< acx
cancelling out < acx and -< acx from both sides, we get
< xcy ≅ < xby (proved)
the answer will be b x² +x-1
step-by-step explanation:
answer: 25\pi\ ft^2 (first option)
step-by-step explanation:
the formula for calculate the area of a circle is the one shown below:
a=r^2\pi
where r is the radius of the circle.
xy is the diameter. then the radius is:
r=\frac{10ft}{2}\\r=5ft
substitute values into the formula shown above. therefore, the area of the circle is:
a=(5ft)^2\pi \\a=25\pi\ ft^2
~ i think hope dis
Other questions on the subject: Mathematics
- A calculator is listed for $110 and is on clearance for 35% off. Sales...
- Sheldon can read 7 pages in 15 minutes. Amy can read 14 pages in 1 hou...
- Venn diagram question...
- Which proportion can you use to find the value of a?...
- A) Convert 30 inches to centimetres. centimetres...
- The data represents the average number of daylight hours each month in...
- Ratio question! Please explain...
- Please explain or give a reason...
- How do I justify my answer?...
- A factory manufactures a metal piece in 32 minutes. New technology all...
