![40029595](/avatars/43666.jpg)
40029595
05.11.2020 •
Mathematics
The frequency distribution shows the average number of pupils per teacher in the United States. Find the variance and standard deviation for the data. Round your answers to one decimal place.
Class limits Frequency
9-11 1
12-14 17
15-17 13
18-20 8
21-23 2
24-26 1
Download data
Variance =
Standard deviation =
Solved
Show answers
More tips
- P Philosophy How did the concept of module arise in computer science?...
- D Dating, Love, Relationships Why Should the Man be Active and the Woman Passive during Foreplay?...
- S Society and Politics Выборы: Смысл, Значение и Отражение...
- B Business and Finance How to Get Your Money Back When Lending? Top 7 Ways...
- F Family and Home Do Lullabies Help Babies Sleep or Is it Just a Myth?...
- F Family and Home Why Does God Punish Us Constantly and How Can We Fix It?...
- D Dating, Love, Relationships Why do we feel shame?...
- S Society and Politics How Could Nobody Know About the Dead Mountaineers?...
- O Other How to Accidentally Get a Rare Coin with Your Change and How to Know Its Value?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
Answers on questions: Mathematics
- M Mathematics The area of this circle is 42 π m2. what is the area of a 60° sector of this circle. this is just to people : )...
- M Mathematics Asuit is on sale for 71% off. the sale price is $121.80 what is the regular price?...
- M Mathematics The coordinates of endpoint d in cd are at d (5,5).if the midpoint of the segment is at m(1,_1)what are the coordinates of point c?...
- M Mathematics How many odd factors does 768 have @ 0(b) 1(c) 2(d) 3(e) 4...
- M Mathematics Assume that a national restaurant firm called bbq builds 15 new restaurants at a cost of $1 million per restaurant. it outfits each restaurant with an additional $200,000...
- M Mathematics Aresearcher computes the definitional formula for ss, and finds that σ(x − m) = 44. if this is a sample of 12 scores, then what would the value of sample variance be...
- M Mathematics On the side of an old downtown building, sarah is painting a circular mural. she will paint the city s name on a 16-foot (ft) horizontal section located 6 feet below...
- M Mathematics Conduct the hypothesis test: a simple random sample of front-seat occupants involved in car crashes is obtained. among 2823 occupants not wearing seat belts, 31 were...
- M Mathematics Suppose that h(ω) is the fourier sine transform of h(x) and h(ω) = s(ω) c(ω), where s(ω) and c(ω) are the fourier sine and cosine transforms of s(x) and c(x), respectively....
- M Mathematics Each card in a deck has a positive integer written on one side. bjorn and dagmar each draw two cards and divide the number on the first card by the number on the second...
Ответ:
Variance = 9.8
Standard deviation = 3.1
Step-by-step explanation:
Group Midpoint X Frequency f f*x x^2 f*(x^2)
9 to 11 10 1 10 100 100
12 to 14 13 17 221 169 2873
15 to 17 16 13 208 256 3328
18 to 20 19 8 152 361 2888
21 to 23 22 2 44 484 968
24 to 26 25 1 25 625 625
SUM 42 660 1995 10782
Mean (x) = ∑(f*x) / ∑f
Mean (x) = 660/42
Mean (x) = 15.7142857143
Variance = ∑(f*x^2) / ∑f - (Mean^2)
Variance = [10782/42] - [15.71428571432 ]
Variance = 9.77551020408
Variance = 9.8
Standard deviation =![\sqrt{Variance}](/tpl/images/0870/5514/7342b.png)
Standard deviation = 3.12658123261
Standard deviation = 3.1
Ответ: