3. Use the formula to evaluate the series 1 - 2 + 4 - 8+ ... - 10. Sn
a1(1-7)
1-r
In the formula for a finite series, a, is the first term, r is the common ratio, and n is the number of terms.
-341

1023
-1023

it's going to be negative -1023 i think

step-by-step explanation:

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: