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From past experience, it is known that 90% of one-year-old children can distinguish their mother's voice from the voice of a similar sounding female. A random sample of 20 one-year-old children are given this voice recognition test. Calculate the mean
The messenger goes by land to a dock and then travels on a river against a current of 4 mi/h. He reaches the destination in 4.5 hours and then returns to the starting point in 3.5 hours. How far did the messenger travel by land and how far by wate..
In how many ways can a supermarket chain select 7 out of 19 possible sites for the construction of new supermarkets?
A used motorcycle can be purchased for $500 cash or on credit with a $200 down payment plus payments of $70 per month for 5 months. How much would be saved by paying cash?
Assuming that the weights of firemen are normally distributed, to test her research hypothesis the statistician would use a chi-square test. In that case, what is the computed test value?
Define a relation R as the set of all pairs of bit strings (x, y) where x and y are bit ?strings with the same number of 0's. Prove R is an equivalence relation.
A street light is mounted at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 8 ft/sec along a straight path
151 g of water at 79.0°C are mixed with 75.2 g of water at 23.0°C. If no heat is lost to the surroundings, what is the final temperature of the water? The specific heat of water is 4.184 J/g·°C.
Set up an equation and solve the following problem. The length of a rectangular floor is 8 meter less than twice its width. If a diagonal of the rectangle is20 meters, find the length and width of the floor.
mathew needs to put 30 posters on the exhibit hall. ten of the posters are 24 inches by 39 inches the others are 18
What is the cost of removing 90% of the heavy metals? Evaluate limx→100- C (x). Write a sentence to interpret your result in part (b). Also explain why limx→100+ C (x) can not be considered.
explain the difference between a combination and a permutation. when applying these counting methods in practical
If the point A (3,4) is translated by the column vector (2,-5), what would be the co-ordinates of its image?
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