A college prep program compared the practice SAT math scores given before and after a seven-week instruction for each student. The scores are given below. Student 1 2 3 4 5 6 7 8 9 Before 750 800 500 520 490 670 600 410 440 After 780 800 550 550 570 690 700 440 480 Test if the average score has been raised by more than 30 points and find the -value (round off to second decimal place). Assume normal population.

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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:

they go with it happens or they mite give a chance?

step-by-step explanation:

answer: a) 56% women

b)44% men

step-by-step explanation:

6 and 24

step-by-step explanation:

6 x 4 = 24