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1

Standard deviation

Standard deviation is the square root of the sum(number-mean)squared/number of data-1

SD= ,/€(X-M)2/n-1

2

Mean

Average

3

Median

Middle

4

Mode

Most common

5

How many fall within 1 point of SD? 2 points? 3 points?

68%
95%
98%

6

Time weighted average

((C1×T1)+(C2×T2)....)/ Tt

7

Accident frequncy

#LTI/total hours worked x 200000

8

Accident severity

#LTD/total hours worked x 200000

9

Wet bulb globe temperature indoors

WBGT=0.7TWB+0.3TG

10

Wet bulb globe temperature outdoors

WBGT= 0.7TWB+0.2TG+0.1TDB

11

Sample volume

SV=LOD/(EL×F)

12

Air sampling - air flow LEV

Q=V×A

13

Air sampling - dilution ventilation

N=(60×Q)/vol

N- air exchange rate
Q- dilution air flow rate(cfm)
Vol- building enclosure volume

14

Duct total pressure

TP=VP+SP

TP- TOTAL PRESSURE
VP- VELOCITY PRESSURE
SP- STATIC PRESSURE