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**Transcribed Problem:**
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3. 次の表に示すように、8社の株価が3月と8月の年2回の調査で記録されたものについて、株価の上昇率が0%以上になった会社数の割合を求めよ。また、これに基づいて、株価の上昇率が0%以上になる確率を求めよ。

会社名     A      B      C      D      E      F      G      H 
3月        120    150    170    100    200    180    140    160
8月        130    140    190    90     210    175    150    170
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**Translation:**

Given the table below, showing the stock prices of 8 companies recorded twice a year in March and August, calculate the proportion of companies with a 0% or higher rate of increase in stock price. Based on this, determine the probability that the stock price will increase by 0% or more.

| Company | A  | B  | C  | D  | E  | F  | G  | H  |
|---------|----|----|----|----|----|----|----|----|
| March   | 120| 150| 170| 100| 200| 180| 140| 160|
| August  | 130| 140| 190| 90 | 210| 175| 150| 170|

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**Solution:**

1. **Calculate the rate of increase for each company** from March to August:

   - Company A: \(\frac{130 - 120}{120} \times 100\% = \frac{10}{120} \times 100\% \approx 8.33\%\)
   - Company B: \(\frac{140 - 150}{150} \times 100\% = \frac{-10}{150} \times 100\% \approx -6.67\%\)
   - Company C: \(\frac{190 - 170}{170} \times 100\% = \frac{20}{170} \times 100\% \approx 11.76\%\)
   - Company D: \(\frac{90 - 100}{100} \times 100\% = \frac{-10}{100} \times 100\% = -10\%\)
   - Company E: \(\frac{210 - 200}{200} \times 100\

Learn how to calculate the proportion of companies with a 0% or higher rate of increase in stock prices based on data from March and August. Understand the probability of stock price increases using statistical methods and percentage calculations.

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