Kerri ran the same distance in four different races. her times were 18.04 seconds, 21.39 seconds, 12.99 seconds, and 14.14 seconds. if the individual times are rounded to the nearest one-tenth of a second, what is the estimate of kerri's total time for all four races?

The estimate rounded to the nearest one-tenth of a second is 66.6 seconds

Step-by-step explanation:

To find the total time T for all of the four races, we sum the time of each race.

So T = 18.04+21.39+12.99+14.14 = 66.56 seconds.

Now we have to round to the nearest one-tenth of a second, which is the first decimal value.

If the second digit was between 0 and 5(it means 66.50, 66.51, 66.52, etc) the total time would be rounded to 66.5 seconds

Since the second digit is 6, the time is rounded to 66.6 seconds.

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

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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