Jiayang's answer to Chowder's Junior College 1 H1 Maths question.
Omg sorry i forget to tell you that im using the right tail z table. The neg one i havent learn yet. If ure free can u help me explain using the right tail table pls pls pls
So apparently for right tailed it's pretty much the same. Instead of looking at eg. p(x<10) it's now p(x>10).
So our Qn the arrow was < to use the right tailed you need to do the 1 minus to change the arrow to >
So you'll end up with 1-0.15= 0.85
But now your table doesn't have values >0.5 cus it's right tailed you have to look at 1-0.85 which is 0.15
Then you do the same o interpolation and take the negative
So our Qn the arrow was < to use the right tailed you need to do the 1 minus to change the arrow to >
So you'll end up with 1-0.15= 0.85
But now your table doesn't have values >0.5 cus it's right tailed you have to look at 1-0.85 which is 0.15
Then you do the same o interpolation and take the negative
Yup. But 1-0.15 i got 0.85. And the probability for 0.85 is 0.1997. And i didnt get the exact same ans as yours?
You're reading the values wrongly. See how I got 1.03 and 1.04
The numbers on the borders are Nott he probability density, they are the z values
The values inside are the probability density values, look for 0.15 there
The numbers on the borders are Nott he probability density, they are the z values
The values inside are the probability density values, look for 0.15 there
Which you won't be able to find cus they only give 0.1515 and 0.1492. that's when you should interpolate between these two values to get the corresponding z value
Wait omg means i read wrongly all this while? But i thought 0.15 is the z value? Ok sorry but last Q how do u know if the Q is referring to the z value or the probability? They didnt state that the 15℅ is the probability or the z value. How to know
The Q said 15% of the jumps so it means 15% of the time he jumps below 5m. So statistically speaking, the next time he jumps we can say he got 15% probability of jumping lower than 5m
Which course are you in btw. I'm curious
Which course are you in btw. I'm curious
The question doesnt really always tell the z value? Is it correct if i say if theyre using perventage its always probability and not z value? Im taking chemical engineering course
Of all the qns I've encountered they won't tell me the z value. Most won't tell me I have to standardise first either. I guess if you have missing mean and/or SD then you'll have to use the standard z table. Cus calcs need the mean and SD for calculations.
Oh okok thank you
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