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3 years ago

The amount of money that Tom had in his pension fund in 2016 was £55 000.

Mathematics

1 answer:

expeople1 [14]3 years ago

5 0

Answer:

I got 178,000,im not sure if it's right

Step-by-step explanation:

but what I did was I multiply 8,200 and 15 together and got 123,000 and then added 55,000 and got 178,000

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A biology teacher wants to know which dissection his students liked best this semester, so he randomly selects eights students f

natali 33 [55]

Answers:

a) The 40 students selected to participate in the survey (8*5 = 40).
b) The population is the set of all students in his five classes combined.

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Explanation:

The teacher wants to know something about his students, so he's only focused on them and no one else. The teacher has 5 classes. Let's say each class has 40 students. That would mean 40*5 = 200 students total are taught by this bio teacher, and these 200 students make up the population. We're not considering any other student in this school since they are not in this teacher's class.

Once the population is well formed and well defined, the sample is drawn from the population. Specifically, the teacher is randomly selecting 8 people from each class. The teacher is using the stratified sample technique. Each class is a stratum, ie, a separate group. The plural of stratum is strata. Because there are 5 classes, and 8 people selected per class, this leads to an overall sample of 8*5 = 40 students. Those 40 students chosen randomly fairly represent the 200 students in the population. Therefore, this process is fairly unbiased.

Be sure not to mix stratified sampling with cluster sampling. Cluster sampling is not performed here because that would mean the teacher randomly selects say 2 classrooms (ie clusters) and samples everyone in each cluster selected. Instead, the teacher is only picking representatives from each class, as if those people were elected to office. As you can probably guess, cluster sampling can be expensive in terms of time and money, so if you need to apply a cluster sample, then it's best to make the clusters as small as possible but also make sure each cluster is reflective of the population.

5 0

3 years ago

Who can solve this exercises pleaseeee i have a exam

Leona [35]

Answer:

Step-by-step explanation:

1) Two angles supplementary. So sum of two angles is 180

One angle = x

Other angle = 2x

x + 2x = 180

3x = 180

x = 180/3 = 60

The angles are 60, 120

2)Two angles complementary. So sum of two angles is 90

one angle = x

Other angle = x + 20

x +x +20 = 90

2x + 20 = 90

2x = 90- 20

2x = 70

x = 70/2 = 35

The angles are 35,55

3) one angle =x

Other angle = 3x - 20

x + 3x - 20 = 120

4x = 120 + 20

4x = 140

x = 140/4 = 35

The angles are 35,85

5) x + 4x -20 = 180

5x = 180 + 20

5x = 200

x = 200/5 = 40

x = 40

6) This sum is not clear only half is visible

5 0

4 years ago

Thank u in advance!!

Dafna1 [17]

Answer:

Dilation

Step-by-step explanation:

Refraction, rotation and transformation are rigid motions,

so, they produce congruent figures.

Dilation does not preserve side length, so it is not a congruence transformation.

6 0

2 years ago

Read 2 more answers

Simplify each od the following ratios a) 15/24 :9/7 b) 2/3 : 3/2 : 5/8

Margaret [11]

Answer:

Fourth Option

Step-by-step explanation:

In order to find the answer to this question you must find the common number and then divide the numerator and the denominator by that number.

$\frac{15}{24}$

$CN=3$

$15\div3=5$

$24\div3=8$

$=\frac{5}{8}$

Hope this helps.

8 0

3 years ago

PLS HELP ITS URGENT

vfiekz [6]

Answer:

Surface area=48 in^2

See the image for solution

7 0

3 years ago