Normal distributions are very commonly used for quality control in manufacturing. For example, a manufacturer of light bulbs would surely be interested in studying how long their bulbs last. In one case, the lifetime of one model of light bulb is normally distributed and has a mean X = 2400 hours and a standard deviation of s = 150 hours. What percentage of bulbs would you expect to last longer than 1950 hours? 34.1% 34.1% 0.1% 13.6% 13.6% 0.1% 2.2% 2.2% X-3s X-2s X-s X+s X+2s X+3s O 0.1% O 97.7% O 50% O 99.9%
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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