4) 8
Toy cars and boats are
shared in the ratio 7:4. If
there are 66 toys in total,
how many boats are there?

44

Step-by-step explanation:

Toy cars : boats

7             :   4

11u-> 66

1u->6

4u-> 44

1/3 + 1/5 = 8/15.

step-by-step explanation:

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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: