Spreadsheet: wrong value from formula

xls_spec.rb

#encoding: utf-8

require 'spreadsheet'

xls_file_name = "/tmp/status_data.xls"

xls_book = Spreadsheet.open(xls_file_name, "rb")
xls_book.worksheet(0).each do |row|
puts row[6].value if row[6] and row[6].is_a?(Spreadsheet::Formula)

end

With above script I get

/tmp> ruby aya.rb
7.5
5.37
7.52
9.78

with your sample XLS (not modified by me) on my Gentoo Linux.

Best
Zeno