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Edexcel AS Mathematics: Statistics S1- 13 June 2018: Unofficial Mark Scheme. watch

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    1a) a = 0.2
    b = 0.6
    c = 0.1
    1b) F(7) = 0.9

    spinner:
    a = 0.1
    b = 0.35
    E(Y) = 4
    Var(Y) = 63.9?
    P(Y>X) = 0.55

    histogram question:
    2.5 width and 2.4 height
    median 7.46
    mean 8.115
    skew: 0.5

    bead question:
    P(bead = green) = 1/32
    P(two reds given one is red) = 5/37

    4.a) P(µ < X < 17) = 0.1
    b. 0.441

    regression:
    t = 17.7 - 0.0126h
    17.7 degrees at sea level
    change: -1.89 degrees

    7a) P(B < 92) = 11.51%
    7b) P(B>Q3) = 0.2215
    7c) Q1 = 123g
    7d) 3/16
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    1. a. a=0.2 b=0.6 c=0.1
    b. 0.9
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    p0tatoEs
    Am I a farmer Edexcel?
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    For the last question with bettys potatoes should be 6(0.25x0.25x0.5) since there were 6 arrangements of the possible potatoes
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    (Original post by Mario Manalu)
    1. a. a=0.2 b=0.6 c=0.1
    b. 0.9
    agreed
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    for the hisogram one i got 2.5 width and 2.4 height

    median 7.5
    mean 8.115
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    (Original post by CamoAssassin00)
    For the last question with bettys potatoes should be 6(0.25x0.25x0.5) since there were 6 arrangements of the possible potatoes
    wouldn't it be 3 choose 2 potatoes, there are six ways to arrange the potatos but surely you have to remove the duplication of the 0.25 potatoes?
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    You man allow post your working out too. Especially for Q7/6/5 those IMO are kinda mad.
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    (Original post by CamoAssassin00)
    For the last question with bettys potatoes should be 6(0.25x0.25x0.5) since there were 6 arrangements of the possible potatoes
    A friend of mine suggested that as an answer.
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    (Original post by ermalgfffv)
    for the hisogram one i got 2.5 width and 2.4 height

    median 7.5
    mean 8.115
    got those 2 m8
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    (Original post by Squiidsquid)
    wouldn't it be 3 choose 2 potatoes, there are six ways to arrange the potatos but surely you have to remove the duplication of the 0.25 potatoes?
    Nope, one was below q1 one was above q3. Same probability, different potatoes. So it would be 3 permute 3.
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    what did everyone get for the regression line?
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    What was the probability of more than q3? And what was the LQ for last question
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    (Original post by Squiidsquid)
    1a) a = 0.2
    b = 0.6
    c = 0.1
    1b) F(7) = 0.9

    histogram question:
    2.5 width and 2.4 height
    median 7.46
    mean 8.115

    2.
    3.
    4.
    5. -1.89 degrees, something like t = 17.7 - 0.0126h
    6.

    7a) 0.1151
    7b) 0.2215?
    7c)123g?
    7d) 3/32 ?
    i got 8/3 for the height lmao
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    4. a. 0.1
    b. 0.441
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    For question 3 which I believe was a normal distribution did ya'll get 0.44 something
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    (Original post by CamoAssassin00)
    For the last question with bettys potatoes should be 6(0.25x0.25x0.5) since there were 6 arrangements of the possible potatoes
    agreed
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    Did anyone get 5/21 for the probability of picking green, i did it via 2 methods and got the same answer. But i esentially did 5/84/ (probability of rg, rr, yr) as we know there are 47 red.
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    (Original post by kkkfamyh132)
    What was the probability of more than q3? And what was the LQ for last question
    I remember 7b was 0.25 plus 0.1151 so was equal to 0.3651 as was probability up to q3- the probability up to 92
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    (Original post by yoyomynameis...)
    Did anyone get 5/21 for the probability of picking green, i did it via 2 methods and got the same answer. But i esentially did 5/84/ (probability of rg, rr, yr) as we know there are 47 red.
    i thought there were 16 reds?
 
 
 
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