Width of rectangle = x
Length =3x+7
Perimeter of rectangle = 158cm
2(l+w)=158
2(3x+7+x)=158
2(4x+7)=158
8x+14=158
8x=158-14
x=144/8
x=18
Therefore the width of the rectangle is 18cm
Length=3x+18+7
54+7=61cm
Area=lxw
=61x18
=1098^2

8 0

2 years ago

2. Stanford–Binet IQ Test scores are normally distributed with a mean score of 100 and a standard deviation of 15. a. Sketch the

gogolik [260]

Answer:

0.0010,0.2743

Step-by-step explanation:

Given that Stanford–Binet IQ Test scores are normally distributed with a mean score of 100 and a standard deviation of 15

If x represents the scores then

X is N(100,15)

a) See enclosed file

b) Z score = $\frac{x-100}{15}$

c) the probability that a randomly selected person has an IQ test score

i. Over 145.

= $P(X>145) = P(Z>3) = 0.0010$

ii. Under 91

= $P(X$

8 0

3 years ago