Question

Due Date: Score: No Work - No Points Use Pencil Only e Be Neat & Organized 1. (2 points) Write in reduced fraction, 2. (2 points) Write 0.25% in reduced fraction. 3. (2 points) Write 2,5 x 10-in standard notation. 4. (2 points) Write 0.00000000000000625 in scientific notation. 5. (3 points) In a survey of 1400 people at a local mall, 65% of them use a certain brand of shampoo. How many of them use that brand of shampoo 6. (3 points) In a survey of 1250 shopper at a local mall, 1000 of them had a smart phone. What percent of the shopper at that mall had a smart phone? Page 1 of 4 Study Guide 1 Total Points 50

Answer 1

1. 27/50.

27 X 5 X 3 =705 and 50 X 5 X 3 = 450.

5 and 3 are common which gets eliminated.

2. 25 /10000

0.25 % is .25/100 multiplying numerator and denominator by 100 will get 25/10000

3. 0.0000025

10^-6 is equal to 0.000001

4. 6.25 X 10^-15.

There are 14 zeros before 625. Scientific notation starts with first digit and then decimals i.e 6.25. Thus 10 ^-15 will give 14 zeros preceding 625 giving the required notations.

5. 910 is 65 % of 1400. 65 in 100 use brand shampoo so out of 1400 the calculation is 65 / 100 * 1400 gives the required answer.
6. 80 % of 1250 is 1000. 1000/1250 X 100 gives the required answer. 80 out of 100 shoppers in local mall had a smart phone