# A level exam stressWatch

#1
So, I am doing a level bio, chem and maths. Really struggling in maths with the applied units and I don't know what to do.
0

#### Study help in partnership with Birmingham City University

1 week ago
#2
Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.
0
1 week ago
#3
They can definitely be difficult to get your head around. Any topics in particular that are problematic?
0
#4
(Original post by Sinnoh)
They can definitely be difficult to get your head around. Any topics in particular that are problematic?
Mechanics mainly connected bodies and I don't understand the normal distribution.
0
1 week ago
#5
(Original post by VictiniCup)
Mechanics mainly connected bodies and I don't understand the normal distribution.
My advice for connected bodies problems in mechanics is to start over at the beginning of the chapter, back to the last place where things made sense.
Look carefully at the steps taken in the worked examples. Try to apply those same steps in the questions you do. A lot of the time it's the same thing but with the values slightly different.

Tension's an annoying part, especially with pulleys - just treat it as a kind of reaction force. For one particle the tension is what pulls it along, for the other, the tension pulls it back.

What do you understand and not understand about the normal distribution?
0
#6
(Original post by Sinnoh)
My advice for connected bodies problems in mechanics is to start over at the beginning of the chapter, back to the last place where things made sense.
Look carefully at the steps taken in the worked examples. Try to apply those same steps in the questions you do. A lot of the time it's the same thing but with the values slightly different.

Tension's an annoying part, especially with pulleys - just treat it as a kind of reaction force. For one particle the tension is what pulls it along, for the other, the tension pulls it back.

What do you understand and not understand about the normal distribution?
All the probabilities stuff and the questions in the textbook don't make sense.
0
1 week ago
#7
(Original post by VictiniCup)
All the probabilities stuff and the questions in the textbook don't make sense.
Well... doesn't really narrow it down tbh. If I gave you a mean and a variance, would you be able to find the probability of X < some random value x?
The normal distribution gives you the value of a continuous random variable on the x-axis, and the area underneath the bell curve within a range gets you the probability of something being within that range. If it helps, think about definite integration - you find the area from one point to another.
The area underneath the curve of a normal distribution function gives you the cumulative probability. The total area under the curve is equal to 1.

Ignore the y-axis.
0
1 week ago
#8
(Original post by VictiniCup)
So, I am doing a level bio, chem and maths. Really struggling in maths with the applied units and I don't know what to do.
Sophia
0
X

new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• Cardiff University
Wed, 27 Mar '19
• University of Portsmouth
Wed, 27 Mar '19
• Middlesex University London
Wed, 27 Mar '19

### Poll

Join the discussion

#### How old were you when you first saw porn?

I've never seen it (160)
21.86%
Before I was 12 (256)
34.97%
13 (121)
16.53%
14 (90)
12.3%
15 (49)
6.69%
16 (26)
3.55%
17 (9)
1.23%
18 (7)
0.96%
Between the ages of 19 - 25 (12)
1.64%
Over 25 (2)
0.27%