The following two-way table shows the places where high school students have volunteered in the past month. the table will be converted into a relative frequency table. which value is the joint relative frequency of the number of 10th grade students who volunteered at the animal shelter?

9th grade 10th grade 11th grade 12th grade total
animal shelter 6 8 4 10 28
hospital 12 17 13 19 61
library 5 6 4 7 22
boys and girls club 9 14 15 11 49
total 32 45 36 47 160

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?