Generally speaking, it is more appropriate to choose the percentage of the total sample size of first-year mathematics statistics.

Generally, the percentage of the sample size of the first-grade mathematical statistics is more suitable for the actual situation of this topic. There are too many uncertainties, and the sample sampling depends on the number of statistical things. One third can be randomly sampled; If the capacity is too large, it can be randomly sampled by region or by the number of disks (intervals). There is no fixed answer. It depends on the actual situation of life and the workload of people.

A accounts for 25% of the population, B accounts for 30% and C accounts for 45% of the population. It is known that B has 28 more people than A, so how many people are there? There are x people

Then a has 25%x and b has 30% X.

B has 28 more people than A, so 30%x-25%x=28, and the solution is x=560.

What's the percentage of getting an A in Yangzhou? If the total score is 100, above 90 is a, if the total score is 150, above 135 is a. ....

When the sample population is large, what is the appropriate ratio of sample size to sample population? When the sample population is large, the ratio of sample size to sample population can be smaller, 65,438+million customers, and the number of samples collected reaches 1.5%, which is already quite high.

It is best to stratify customer groups and then sample each layer according to a certain proportion. (stratified proportional sampling), which is more scientific.

What is the appropriate ratio of CPU overclocking? Now many motherboards can automatically shut down. As long as your overclocking exceeds the limit of CPU, the BIOS will automatically shut down. In short, you can turn it off after exceeding the maximum value.

Each chip has its own structure. Even the same type of chip. There are individual differences, and I don't know how to tell when I buy it, but the old bird can judge whether the chip is in good condition according to the production serial number of the chip, thus judging the overclocking potential of the chip.

Of course, a good motherboard is also the key to overclocking. A good motherboard can make the CPU frequency go up a storey still higher.

Memory is also an indispensable part ~ ~ ~

Celeron's suggestion is above 166, which has been tested many times.

What is the fat content of human body? 1. Standard body fat content:

Normal normal overweight and obesity

The fat content of standard men is14% ~ 20%14% ~ 20% 20% ~ 25% > 25%.

The fat content of standard women is17% ~ 24%17% ~ 25% ~ 25% ~ 30% > 30%.

Second, the standard body fat content calculation formula:

Formula of standard body fat content: weight (kg) ÷ (height * height) m;

Generally 18 ~ 30 years old has a little less fat content than 30 ~ 69 years old; Therefore, it is normal for people over 30 to be slightly overweight.

The measuring parts of fat measuring instrument: upper arm triceps brachii, scapula, ilium, abdomen, inner thigh, etc.

What is the appropriate proportion of job-hopping salary? The salary after job-hopping should be guaranteed to rise, 10% to 20%, and more depends on your ability.