Question

Ok its two questions

A coffee shop surveyed three groups of 5 customers to find out how many cups of coffee the customers drink in one day. The table shows the results of the three samples.

Survey
Cups of Coffee
Group 1
 {1, 3, 2, 2, 4}
Group 2
 {4, 1, 3, 2, 1}
Group 3
{5, 4, 6, 4, 6}
Identify any surveys that are likely biased. Based on the unbiased surveys, estimate the mean number of cups of coffee the customers drink in one day.
Enter your answer in the box. Round to the nearest whole number

and two
A zoo randomly sampled three groups of 100 people on what their favorite type of bear is. The data shows the results of the three samples
Black Bear
Grizzly Bear
Polar Bear
Total all 100
Group 1
  Black  24
grizzly 30
Polar 46

Group 2
Black 23
grizzly 34
Polar 43

Group 3
Black 22
grizzly 29
Polar 49
The zoo has 3380 visitors one weekend.
Based on the samples, what is a reasonable estimate of the number of people who will prefer polar bears?
Enter your answer rounded to the nearest whole number in the box

Answer 1

Answer for number 1 is 2 cups
Answer for number 2 is 1555

Answer 2

1-) 2 cups

2-) 1555 people

Explanation:

1-) A quick glance at all three groups shows that group 3 is a clear outlier and thus it is likely biased. Considering just groups 1 and 2, the estimate mean number of of cups of coffee the customers drink in one day is:

`Mean = (1+3+2+2+4+4+1+3+2+1)/(10) \\Mean = 2.3`

Rounding it to the nearest whole number, the average is 2 cups.

2-) The percentage of people who prefer polar bears is roughly the ratio of interviewed people who prefer polar bear to the total number of people interviewed:

`P=(46+43+49)/(300) \\P=0.46`

In a weekend with 3380 visitors, a reasonable estimate of people who prefer polar bears is:

`N= 0.46*3380\\N= 1554,8`

Rounding to the nearest whole number, the estimate is 1555 people.