Test
200-220
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Preguntas del test (21)
1What is the mode for the above stem and leaf plot?
- A28
- B32
- C34
- D43
2What is the median for the above stem and leaf plot?
- A53
- B54
- C56
- D83
3Sammy caught ten rainbow trout, measured their lengths to the nearest inch, and recorded his results in groups as follows: Use the midpoints of the groups to estimate the mean length of the trout Sammy caught.
- A21 inches
- B21.5 inches
- C22 inches
- D22.5 inches
4Sammy caught ten rainbow trout, measured their lengths to the nearest inch, and recorded his results in groups as follows: Use the midpoints of the groups to estimate the mean weight of the rabbits Tommy trapped.
- A11.5lb
- B12lb
- C12.5lb
- D13lb
5What is the population standard deviation for the numbers: 75, 83, 96, 100, 121 and 125?
- A16.9
- B17.1
- C17.6
- D18.2
6Ten friends scored the following marks in their end-of-year math exam:23%, 37%, 45%, 49%, 56%, 63%, 63%, 70%, 72% and 82%. What was the standard deviation of their marks?
- A15.1%
- B15.5%
- C16.9%
- D18.6%
7A booklet has 12 pages with the following numbers of words: 271, 354, 296, 301, 333, 326, 285, 298, 327, 316, 287 and 314. What is the standard deviation number of words per page?
- A22.6
- B22.0
- C21.9
- D21.4
8Nine friends each guessed the number of marbles in a jar. When the answer was revealed they found they had guessed well (and one was the winner!). Here is how close they each got: -9, -7, -4, -1, 0, 2, 7, 9, 12. What was the standard deviation of their errors?
- A3.9
- B5.5
- C6.2
- D6.8
9Emma rolled a die a number of times and recorded her results in a bar graph, as follows: What was the variance?
- A3.25
- B2.92
- C1.89
- D1.80
10What is the standard deviation of the first 10 natural numbers (1 to 10)?
- A2.45
- B2.87
- C3.16
- D8.25
11What is the variance of the first 10 numbers of the Fibonacci sequence {0, 1, 1, 2, 3, 5, 8, 13, 21, 34}?
- A10.47
- B16.88
- C109.56
- D285.01
12211. The standard deviation of the numbers 3, 8, 12, 17 and 25 is 7.56 correct to 2 decimal places. What happens if each of the five numbers is increased by 2?
- AThe standard deviation is increased by 2
- BThe standard deviation is decreased by 2
- CThe standard deviation is multiplied by 2
- DThe standard deviation stays the same
13212. The population standard deviation of the numbers 3, 8, 12, 17, and 25 is 7.563 correct to 3 decimal places. What happens if each of the five numbers is multiplied by 3?
- AThe standard deviation is increased by 3
- BThe standard deviation is decreased by 3
- CThe standard deviation is multiplied by 3
- DThe standard deviation stays the same
14213. Ramiro did a survey of the number of pets owned by his classmates, with the following results: What was the standard deviation?
- A1.38
- B1.49
- C1.60
- D2.27
15214. Rachel rolled a die forty five times with the following results: What was her mean score?
- A3.4
- B3.5
- C3.62
- D7.5
16215. Olivia chose a 100 word passage and recorded the number of letters in each word. Her results are shown in the following bar graph:
- A4.29
- B4.39
- C4.49
- D4.5
17216. Emma rolled a die a number of times and recorded her results in a bar graph, as follows: Calculate the mean score
- A3
- B3.5
- C4
- D6.67
18217. Miss Jones has 30 students in her math class. In the recent exam, her students averaged 67%. But Miss Jones told Principal Schultz that her students had averaged 71%. In order to impress Principal Schultz, Miss Jones had excluded the two outliers in her class who had scored very low marks. What was the mean mark of those two poor students?
- A6%
- B12%
- C9%
- D11%
19218. 50 children guessed the number of marbles in a jar and the average guess was 627.
However three of the guesses were way too high and so were excluded from the competition. When these three outliers were excluded, the average guess was reduced by 114. What was the mean of the three outliers?- A513
- B1.539
- C2.413
- D5.7
20219. The following table gives the heights of 10 friends, each measured to the nearest centimeter: If the height of the outlier is not included, which one of the nine remaining friends has the mean height?
- ABeth
- BEmily
- CHelen
- DJeremy
21220. The following table gives the math scores of 10 friends: If the score of the outlier is not included, what is the mean score?
- A35.1%
- B39%
- C44.4%
- D49.3%
Información
- Descripción
- Test sobre 200-220, creado por Jaxxx JQ el 28/12/2019.
- Autor
- Jaxxx JQ
- Idioma
- English
- Visitas
- 15
- Valoración
- Aún sin valoraciones Valora este test