7. a city has a population of 2,549,786 people.
estimate this population to the nearest million.
express your answer as the product of a single
digit and a power of 10.
rounded to the nearest million, the population
is about
written as the product of a single digit and
a power of ten, this number is
x 10

1)

2)

Step-by-step explanation:

1) To round a number to the nearest million, you must look at the digit located in the hundred thousands place. If this is greater than or equal to 5 you must round up, and if this is less than 5, you must round down.

In this case you know that the city has a population of .

You can notice that the digit located in the hundred thousands place is 5, therefore, you must round up:

2) Scientific notation has the following form:

Where "a" must be a number from 1 to 10 but not including 10 and "n" must be an integer.

To express in Scientific notation, the decimal point must be moved 6 places to the left; therefore, the exponent will be positive.

Then:

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: