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Shower-cleaner liquid is sold in spray bottles. The volume of liquid in a bottle may be modelled by a normal distribution with mean 955 ml and a standard deviation of 5 ml. Determine the probability that the volume in a particular bottle is:

a) at most 960 ml

Let X be the volume of liquid in a particular bottle, then we want to find P(X <= 960). We first need to transform from X to Z (to the standard normal distrib...

SS
Answered by Sarah S. Maths tutor
6489 Views

A gym has 275 members. 40% are bronze members. 28% are silver members. The rest are gold members. Work out the number of gold members.

Firstly, we can calculate the total percentage of gold members = Total - bronze - silver

Therefore, %gold = 100% - 40% - 28% = 32%

So we know that 32% of 275 members are gol...

SS
Answered by Sarah S. Maths tutor
10100 Views

How to calculate sin, cos and tan

SOH CAH TOA (imagining each as a triangle)

S = sin

C = cos

T = tan

O = opposite

H = hypotenuse

A = adjacent

PH
Answered by Phoebe H. Maths tutor
3260 Views

Use the product rule to differentiate y=2xsinx

The product rule states that y=uv and dy/dx=(u)dv/dx + (v)du/dx. As the equation is in this form we can let u=2x and v=sinx. Therefore du/dx=2 and dv/dx=cosx. Substituting for u and v we get dy/dx=(2x)(co...

GK
Answered by Georgianna K. Maths tutor
14828 Views

Solve the simultaneous equations: 5x + 3y = 41 and 2x + 3y = 20 Do not use trial and error.

  1. 5x + 3y = 41   2) 2x + 3y = 20 Subtract equation 2) from equation 1) to cancel the y's (3y-3y = 0) .  Next we subtract  the x's (5x - 2x = 3x) and then finally we have 41 - 20 = 21. We now have that...
DT
Answered by David T. Maths tutor
19724 Views

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