So this question, as the data have been given that mule is equal to four days and the standard division Sigma is given as one day. And then you didn't start at normal distribution concept so we can use the formal offset here, which is given by X minus mu upon sigma. And if I substitute the value here, this would be equal to X minus for born one. So now the first question is to find out the probability off X is greater than to not this part I can write down as one minus probability. Off X is less than equal group. So to find out the value of excellence, any point to where I need to find out that said value. So I had X is equal to do. We can find out said, which is true minus fall upon bond, which gives you minus two. So this will actually change to one minus the off there is less than equal to minus two. And, uh, this is from the table. We can ride one minus 0.28 And if you calculate the value of getting her this 0.977 so this was the first part that we've done off a little bit of second part. You say that suppose n is Ah, you said that, you know, the end of dreams should be protest. Okay. And, uh, therefore, you say that on average, wondering should and in 60 of one end ese But so I never write down that at X is equal to 60 upon in value. We're going to find out that so that everybody will do 60 or one in minus four. And the whole thing is divided by one. So now they've told us that this probably use 80%. So therefore, I don't that Thomas probability off Zed greater than equal 60 upon end minus four is given as 80% switches. Wind eight. So took. I feel this proverb gives a great Then you go. I can write down the says one minus probability off cell is less than equal to 60 our own and minus four, which is going eight. And now I've got to simplify its expression to find the value off zey. So if I do one minus 10.8, this will be equal to probability. Off there was less unequal toe 60 by end minus four. So this is 0.0 is equal to provide witty off their lesson. It could do 60 upon end minus four. Now you do this part, the value at Pointe Du from the table is going to be 0.8 for, so I have point off. 84 is equal to 60 upon and minus four. So therefore the answer is 60 opponent, which is equal to 4.84 I can capture the value of and therefore just equal to 60 a coin. 4.84 just giving me drill 0.39 And, uh so I can approximate this value and can see. Therefore, in total, there are 14 dreams.