NOTE: The numerical values in this problem have been modified for testing purposes. Suppose composite scores on the ACT test for the high school graduating class in a certain year had mean 20.9 and standard deviation 5.3. In all, 1,799,243 students in this class took the test. Of these, 170,777 had scores higher than 28 and another 54,167 had scores exactly 28. ACT scores are always whole numbers. The exactly Normal N(20.9,5.3) distribution can include any value, not just whole numbers. What is more, there is no area exactly above 28 under the smooth Normal curve. So ACT scores can be only approximately Normal. To illustrate this fact, find (a) the percent of ACT scores greater than 28 using the actual counts reported. (Enter your answer rounded to two decimal places.) percent: (b) the percent of ACT scores greater than or equal to 28, using the actual counts reported. (Enter your answer rounded to two decimal places.) percent: %
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.
Help!!
Normal distribution:
It is a continuous probability distribution, that is bell-shaped with lighter tails, symmetrical on both sides of the mean. The area under the normal distribution curve is the probability and the total probability is 1 similarly, the total area under the curve sums to 1.
In a normal distribution, the probability of a particular range is calculated by converting it into a standard normal and finding the value in the Standard normal distribution table.
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