“…Birnbaum (1956), Gupta (2005, 2006), Razaei, Tahmasbi, andMahmoodi (2010), Hussian, (2013) studied the estimation of R for different distributions. The recorded values and more studies about R with different distributions and different methods of estimation found in Baklizi (2008Baklizi ( , 2014, Essam (2012), Tarvirdizade, and Kazemzadeh Garehchobogh (2014).…”