how do i answer this

A hospital wants to compare its annual patient turnover rate per bed with similar hospitals. The turnover rates for a sample of 80 beds at the hospital are shown in the table to the right. (An annual turnover of 21 per bed indicates that, during the year, 21 patients occupied the same hospital bed.) What is the mean turnover rate? The mean turnover rate is D. (Round answer to one decimal place.) Annual Tu rnoverRate 10 & under 15 15 & under 20 20 & under 25 25 & under 30 30 & under 35 35 & under 40 40 & under 50 50 & under 60 Number of Beds 14 28 12 .b