Juan makes a measurement in a chemistry laboratory and records the result in his lab report. The standard deviation of students' lab measurements is o = 10 milligrams. Juan repeats the measurement 4 times and records the mean x of his 4 measurements. Step 1: What is the standard deviation of Juan's mean result? That is, if Juan kept on making 4 measurements and averaging them, what would be the standard deviation of all his x 's? Give your answer as a whole number. standard deviation: Step 2: How many times must Juan repeat the measurement to reduce the standard deviation of x to 2? Give your answer as a whole number. number of times repeating measurements:

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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.