Yet there is considerable opposition to the use of genetically modified plants for food production and other uses. Genetic engineering offers a time-saving method for producing larger, higher-quality crops with less effort and expense. You are a tomato farmer whose crops are threatened by a persistent species of beetle. 2  Each year, you spend large sums of money for pesticides to protect your crops.
To calculate the variance follow these steps: 1  Work out the Mean (the simple average of the numbers). 2  Then for each number: subtract the Mean and square the result (the squared difference). 3  Then work out the average of those squared differences.
1 Write the values from your normal distribution at the bottom. 2  Start with the mean in the middle, then add standard deviations to get the values to the right and subtract standard deviations to get the values to the left. 3  Write the percents for each section (you will need to memorize them!) 0.15, 2.35, 13.5 and 34.