Ibrahim has two lists of numbers. The mean of the numbers in the first list is p.
The mean of the numbers in the second list is q.
Ibrahim combines the two lists into one new list of numbers.
Ibrahim says 'The mean of the new list of numbers is equal to
p+a
2
One of two conditions must be satisfied for Ibrahim to be correct.
(b)
Write down each of these conditions.
Condition 1
Condition 2
pls show working out

d is correct

step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

the answer is  

a.

4,624π mm2

step-by-step explanation: