G 7. In another study of these cities, customers were sampled by age. The totals for the cities and ages are given. a. What is the expected frequency in the Age 21-30 / Kingston cell? A. 12 Your answer is not correct. B. 6 This is the correct answer. C. 100 D. 18 b. What is the expected frequency in the Age 51-60 WINDSOR cell? A. 14 Your answer is correct. B. 35 C. 10 D. 12

Between age of the 21-30 of kingston cell,as by studying of these cities,the expected frequency is 35 option  A is correct.

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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:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,