Answer:
E 0.923
Step-by-step explanation:
The Z score is a measurement used in statistics to determine the relationship between a value and a mean of a group of values measured as standard deviation from the mean. The z score (z) is given as:
, Where μ is the mean, σ is the standard deviation and x is the value.
Given that:
σ = 7, μ = 80 and x = 90
From the normal distribution table, P(X < 90) = P(z < 1.43) = 0.923
Answer:
5/6 and 6/7
Step-by-step explanation:
In the top of the fraction its going up by one each time (1,2,3,4 so the 5 and 6 would be the top half of the fraction), and in the bottom half its also going up by one but it started at 2 so its one more than the top half (2,3,4,5, so the 6 and 7 would be the bottom half of the fraction)
X+6 is the answer to the question.
Answer:
36 and 144
Step-by-step explanation:
Sum the parts of the ratio, 2 + 8 = 10 parts
Divide the sum of the 2 numbers by 10 to find the value of one part of the ratio.
180 ÷ 10 = 18 ← value of 1 part of the ratio, thus
2 parts = 2 × 18 = 36
8 parts = 8 × 18 = 144
Thus 2 numbers are 36 and 144
