The amount of sleep that elementary school children get per night follows a normal distribution with a mean of 9.5 and a standard deviation of .55 hours. a) find the proportion of elementary school children who get between 9 and 10 hours of sleep per night. sketch the normal curve and shad the area under the curve that is the answer to the question.

b) is it unusual for an elementary school student to get at least 12 hours of sleep? justify your answer.

hey! so 1 (25) out of 4 (100) is 25 so your answer is 25%. it's like quarters!

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc

the answer is 1 becuz if it were 1.0 that would rip apart the entire so ya. : )

~potato.

copyright potato 2019.

-3.5 degrees per hour

step-by-step explanation:

find the unit rate:

-12   1/4 degrees           12.25 degrees

= - = -3.5 degrees per hour

      3   1/2 hours               3.5 hours