Given:
bottom of the plank or ground is 9 feet from the wall
length of the plant is 41 ft
height of the wall is unknown.
Let us use the Pythagorean theorem.
a² + b² = c²
a² + (9ft)² = (41ft)²
a² + 81 ft² = 1,681 ft²
a² = 1,681 ft² - 81 ft²
a² = 1,600 ft²
√a² = √1,600 ft²
a = 40 ft
The height of the wall is 40 ft.
Answer: 0.547
Step-by-step explanation:
As per given , we have
Population mean =
Population standard deviation=
Sample size : n= 36
We assume that number of apps used per month by smartphone owners is normally distributed.
Let be the sample mean.
Formula :
The probability that the sample mean is between 19.5 and 20.5 :-
[using standard normal distribution table for z]
Hence, the required probability = 0.547
Answer:
b
Step-by-step explanation: