Calculating number of cells/ml * Cells per ml = number of cells counted in 4 squares X 104" *(tim %3D 4 time **See below for calculation of the variance and standard deviation

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I’m very confused on how I’m supposed to calculate the two blank columns. The formula has me a bit confused. What exactly am I supposed to subtract? Is “Xi”the number of cells per ml? If so what is “X” represent.
686 4
Sample #
Number of viable Number of
cells in all
four 1Xımm
Xi-X **
(Xi-X)2
cells
ml*
per
(see formula
below)
9.6E+05
830000
squares
384
1
1.42E+05 2.02E+10
332
341
335
852500
3
837500
210000
D02500
కం
324
321
291
627500
787500
80000
852500
935000
81500
737500
827500
755000
X (average #
cells/ml)
251
6.
315
320
341
374
326
10
11
12
13
14
15
16
295
331
302
Variance (s2)**
Standard deviation
76400
(s)**
Transcribed Image Text:686 4 Sample # Number of viable Number of cells in all four 1Xımm Xi-X ** (Xi-X)2 cells ml* per (see formula below) 9.6E+05 830000 squares 384 1 1.42E+05 2.02E+10 332 341 335 852500 3 837500 210000 D02500 కం 324 321 291 627500 787500 80000 852500 935000 81500 737500 827500 755000 X (average # cells/ml) 251 6. 315 320 341 374 326 10 11 12 13 14 15 16 295 331 302 Variance (s2)** Standard deviation 76400 (s)**
Formulas
Calculating number of cells/ml
*(times 10 to get # cells per ul;
times 10° to get # cells per ml)
* Cells
per
ml = number of cells counted in 4 squares X 104*
4
**See below for calculation of the variance and standard
deviation
The mean
X = E Xi
(E Xi = sum of the individual values; n = number of samples)
n
*n-1 is the statistical convention when dealing
The variance (s²) = E (Xi-X)²
(n-1)*
with samples from a single population.
https://explorable.com/statistical-variance
S =Vs2 is the standard deviation
Transcribed Image Text:Formulas Calculating number of cells/ml *(times 10 to get # cells per ul; times 10° to get # cells per ml) * Cells per ml = number of cells counted in 4 squares X 104* 4 **See below for calculation of the variance and standard deviation The mean X = E Xi (E Xi = sum of the individual values; n = number of samples) n *n-1 is the statistical convention when dealing The variance (s²) = E (Xi-X)² (n-1)* with samples from a single population. https://explorable.com/statistical-variance S =Vs2 is the standard deviation
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