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hello everyone welcome back in this video lets see how to calculate mttr mtbf and mttf so you have the formula here lets get the result here before that lets calculate the sum of operating time down time and number of failures from this data for that I use the function called sum sum and then I select the entire data close bracket press enter and let me exchange the formula to calculate downtime and number of failure now we have this detail lets calculate the mptr is equal to Total downtime that we have here 21 divided by number of failure we have 24 press enter you have the result of mttr likewise mtbf is equal to Total available operating time so you have 291 divided by number of failure is 24 press enter and then mttf is is equal to mtbf minus mttr result press enter here is the result thank you