\ V : 



Introduction 



\r\ll 



Hut from the observed values of & and #. we iia\ 

 = -00531 2, < = -!M)40.SS, 

 X = '039448, ^ = -960552. 

 Hi-nee by substitution in the above equation 



ze,x- 1-6503, 



and this is the ratio of the probable error of the mode to that of the mean. 

 Now the probable error of the mean = '67449<r/V^ = '004092. 

 Thus the probable error of the mode 



= -00409 x 1-6503 = -00675+ 

 and we should write our results as 



Mean = 29-8570 -0041, 

 Mode = 29-9502 -0068. 



In the accompanying diagram, the ranges of likely variation of mean and 

 mode are represented by belts of 2'5 times the probable error plotted on either 

 side of the mean and the mode. 



BAROMETRIC HEIGHT AT LAUDALE. 



tt>0 



BU - 1Mb* ft P.E. -- 29 35021 2-5 -00675 

 = 29-935 to 29-961 



B*tt - Mean t 3-5 PE. = 29-8570 2-5-OO41O 

 > 39 -847 to 29-867 



f>Tod&l Ordm&fe =421-22 



' i i I' 



1 



1 



A 



i l i'i'i'i'i'i l i l i'i'i l i l< i in i'i'i'iiiil-i 



290 Z9-5 MM) 5 



BAROIY1ETRIC HtJGHT 



B. II. 



