The Environmental Club at a school has decided to plant bulbs, bushes, and trees in the spring. Each hallway has a flatbed for donated plants and bulbs. Hallway A has 1/10 bulbs, 2/10 small bushes and 7/10 tree seedlings. Hallway B has 2/10 bulbs 1/10 small bushes and 7/10 tree seedlings. How many flatbeds of tree seedling are there?

Step-by-step explanation:

Given:

Hallway A:

1/10 bulbs

2/10 small bushes

7/10 tree seedlings

Hallway B:

2/10 bulbs

1/10 small bushes

7/10 tree seedlings.

Total flatbed of tree seedlings = flatbed of tree seedlings in hallway A + flatbed of tree seedlings in hallway B

= 7/10 + 7/10

= 14/10

= 1 × 2/5 flatbed of tree seedlings

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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