What is the average CFU/ml in saliva in our class? Look through the enumeration

Question

What is the average CFU/ml in saliva in our class? Look through the enumeration module introduction. The protocol for the lab is included. This set of data refers to the saliva enumeration. Each number (1-31) is a different student who posted their own data for the saliva counts on the petrifilm. The dilution factor comes from the 1:10 serial dilution that was performed to plate the different concentrations. In order to get one number for each student, only one petrifilm, that has colonies between 30 and 300 is counted, the other ones are either TNTC = too numerous to count, or TFTC = too few to count. Now multiply the count of colonies by the dilution factor and write the result in scientific notation. Here is an example: students #1: 227 x 10000000 = 2270000000 = 2.27 x 10e9 Calculate a number for each student and then calculate the mean of all students in the class. That is your average CFU/ml in saliva! Submit your calculations here: Bacteria in saliva enumeration Dilution 10^-1 10^-2 10^-3 10^-4 10^-5 10^-6 10^-7 10^-8 Dilution factor 10 100 1000 10000 100000 1000000 10000000 100000000

1 TNTC TNTC TNTC TNTC TNTC TNTC 227 TFTC

2 TNTC TNTC TNTC TNTC TNTC 41 TFTC TFTC

3 TNTC TNTC TNTC TNTC TNTC TNTC 37 TFTC

4 TNTC TNTC TNTC TNTC TNTC TNTC TNTC 145 6 TNTC TNTC TNTC TNTC TNTC TNTC TNTC 127 7 TNTC TNTC TNTC TNTC TNTC 132 TFTC TFTC 8 TNTC TNTC TNTC TNTC TNTC 81 TFTC TFTC 10 TNTC TNTC TNTC TNTC 87 TNTC TFTC TFTC 11 TNTC TNTC TNTC TNTC TNTC 104 TFTC TFTC 12 TNTC TNTC TNTC TNTC TNTC 32 TFTC TFTC 13 TNTC TNTC TNTC TNTC TNTC 70 TFTC TFTC 14 TNTC TNTC TNTC TNTC TNTC 60 TFTC TFTC 17 TNTC TNTC TNTC TNTC TNTC 36 TFTC TFTC 22 TNTC TNTC TNTC TNTC TNTC TNTC TFTC 151 23 TNTC TNTC TNTC TNTC 176 TNTC TFTC TFTC 24 TNTC TNTC TNTC 56 TFTC TFTC TFTC TFTC 25 TNTC TNTC TNTC TNTC 51 TNTC TFTC TFTC 27 TNTC TNTC TNTC TNTC TNTC TNTC 77 TFTC 28 TNTC TNTC TNTC TNTC TNTC 87 TFTC TFTC 29 TNTC TNTC TNTC TNTC TNTC TNTC TFTC 116 30 TNTC TNTC TNTC TNTC TNTC TNTC 197 TFTC 31 TNTC TNTC TNTC 46 TNTC TNTC TFTC TFTC

Explanation / Answer

2.27x10e9 ; 4.1x10e8; 3.7x10e8 ; 1.45x10e9; 1.27x10e9 ; 1.32x10e9; 8.1x 10e8; 8.7x10e8; 1.04x10e9; 3.2x10e8 ;

7.0x10e8; 6.0x10e8; 3.6x10e8; 1.51x10e9; 1.76x10e9; 5.6x10e8; 5.1 x10e8; 7.7x10e8; 8.7x 10e8; 1.16x10e9; 1.97x10e9 ; 4.6x10e8

This is the number for each student in the class.For each student count of colonies is given. write the count of each student and multiply by the dilution factor which ps 10000000.To write in scientific notation count the number of places from the right till 1 number is left. Place the decimal and and write the places you moved as 10 exponent the places moved.

To find the average add all the counts and divide by the actual number of students.

Here the total is 21,360,000,000 . The total students is 22.

21360000000 /22= 970,909,090.90909.Write the answer in scientific notation, the average for the class is =9.7090909090909x 10e8

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