445 randomly selected light bulbs were tested in a laboratory, 316 lasted more than 500 30) hours. find a point estimate of the proportion of all light bulbs that last more than 500 hours.

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth