Question $13$

A new version of apple watch deployed three transitors series in hope to increase the overall reliability of watch. What is overall reliability of watch after modification. Round your answer to four decimal places.

$\backslash$table$[[$Transitors$,$Reliability,Percentage$],[$Transitor A$,$R$1,0\mathrm{.}90],[$Transistor B$,$R$2,0\mathrm{.}70],[$Transistor C$,$R$3,0\mathrm{.}50]]$

Integer, decimal, or E notation allowed