# I'm not sure how to answer this and I don't even know what type of math it is [closed]

I'm studying for a finals about probability distribution with Z-table and I got to this part in the example of my lecturer and I have no idea how she arrived to this answer, I've been staring at it and scratching my head for a good 30 minutes and still don't know how she got it. I assume this is probably some basic stuff from high school that I just forgot xD, so please help this stupid college student out haha

-2.33 = h-172/8
h = 153.4


How did she get 153.4?

## closed as off-topic by Xander Henderson, max_zorn, Lord Shark the Unknown, user91500, José Carlos SantosJan 17 at 9:33

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question is missing context or other details: Please provide additional context, which ideally explains why the question is relevant to you and our community. Some forms of context include: background and motivation, relevant definitions, source, possible strategies, your current progress, why the question is interesting or important, etc." – Xander Henderson, max_zorn, Lord Shark the Unknown, user91500, José Carlos Santos
If this question can be reworded to fit the rules in the help center, please edit the question.

• Presumably h-172/8 means $\frac{h-172}8$ and not $h-\frac{172}8$. – Arthur Jan 16 at 22:44
• Yes, I didn't know how to write a fraction sorry about that :/ – Bao Hsu Jan 16 at 22:45
• Can you solve $-2=x/4$ or $-2=(x-15)/4$? – Ted Shifrin Jan 16 at 22:48
• @Arthur In fact , in this case, the result is correct when rounded to one digit after the decimal point. – Peter Jan 16 at 22:51
• @TedShifrin I cannot, this seems like some basic math stuff, it's so embarrassing that I can't even solve it. Please help this poor guy out. – Bao Hsu Jan 16 at 22:53

I'll step you through the process for this one. \begin{aligned} -2.33 &= \frac{h-172}{8} \\ -2.33 \times 8 &= \frac{h-172}{8} \times 8 & \text{Cancel division by 8}\\ -2.33 \times 8 &= h-172\\ -2.33 \times 8 + 172 &= h-172 + 172 & \text{Cancel subtraction of 172}\\ -2.33 \times 8 + 172 &= h &\\ h &=-2.33 \times 8 + 172 = 153.36 \approx 153.4\\ \end{aligned}