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hi welcome to my channel this is causal wise and this is the continuation video of replacement model already we have seen three videos related with this topic you can find the playlist Link in the description box now in this video we are going to see group replacement policy okay I will tell you what is the meaning of group replacement policy along with the numerical problem now lets see the problem see the problem the failure rates of 1000 State bulbs in a colony are summarized in the following table so here we have failure rates of State bugs at the end of first month second month third month fourth month fifth month and sixth month okay so this is the probability of failure to the date and here they have given cumulative probability for each and every month separately so we need to find out separately what is the probability at the end of first month second month individually for that we need to find out the difference the difference is called probability of each and every month at