Answer:
200 trees
Step-by-step explanation:
Given that the temperature drops to 30 degrees F, the expected value in this situation is given by the probability of each tree sustaining damage (10%), multiplied by the total number of trees susceptible to damage (2,000 trees):

The mean number of trees showing damage is 200 trees.
The house's value increased by $49,970. The current value of the house is $312,970.
Step-by-step explanation:
Step 1:
The house was valued at $263,000 and this value increased by 19%. So we need to calculate how much 19% of $263,000 is.
To do so we convert the 19% into a fraction by dividing it by 100 and multiplying it with the house's value.
19% of $263,000 = 
So the value of the house increased by $49,970 in several years.
Step 2:
To calculate the current value, we add the increased value to the original value.
The current value = the past value + The increased value,
The current value 
So the current value of the house is $312,970.
Answer:
Correct answer is (a). An online research company puts out a survey asking people two questions. First, it asks whether they buy groceries online. Second, it asks whether they own a car or not. The data are collected and recorded in a contingency table. The company wants to determine if there is a relationship between buying groceries online and car ownership
Step-by-step explanation:
The chi-square distribution can be used to perform the goodness-of-fit test, Closeness of observed data to expected data of the model.