A Level Maths Help

[versed remnant]

I just don't know what to do on this question

[coarse ridge]

the probability of scoring less than 2 points is equal to P(S=0) + P(S=1)

[versed remnant]

yeah i've got a+b = 2c + 0.5

[coarse ridge]

right

[versed remnant]

but idk why to do from ther

there

[coarse ridge]

if the total is 6 points

what are the different ways you can score 6

[versed remnant]

4 and 2, 2 and 4, and 3 and 3

[coarse ridge]

yes

what's the probability of scoring a 4 and then a 2

[versed remnant]

0.15 + c

[coarse ridge]

not quite

[versed remnant]

how come

[coarse ridge]

of scoring a 4 and then also a 2

you have to multiply the probabilities here

[versed remnant]

ah ok

so 0.15c

[coarse ridge]

yes

you can do the same for 2 and 4, then 3 and 3

[versed remnant]

then do that again for 2 and 4

ok

[coarse ridge]

and then you just add them together

you can also do the sum of all the probabilities in the table

which should give 1

so a + b + c + 0.25 = 1

that might also help

[versed remnant]

ok thanks a lot