Answer:
Answer in the pic with steps
Hope it helps
Answer:
the 2nd at the bottom left
0.75 is the decimal format.
Find the LCD of 9/14 and 2/7. LCD is 14.
Make the denominators(bottom numbers) the same as the LCD(14)
Simplify. Now denominators are same and even
Join the denominators so make it into -9 + 4 / 14
Now simplify it lastly
Answer: 5/-14.
Answer:
0.8224
Step-by-step explanation:
Data
- standard deviation, sd: $10
- first value of interest, x1: $63
- second value of interest, x2: $90
z-score for x1:
z1 = (x1 - mean)/sd = (63 - 76)/10 = -1.3
z-score for x2:
z2 = (x2 - mean)/sd = (90 - 76)/10 = 1.4
The proportion of wrist watch prices are between $63 and $90 is:
P(z1 < z < z2) = P(z < 1.4) - P(z < -1.3)
P(z < 1.4) = 0.9192 (see first picture attached)
P(z < -1.3) = 0.0968 (see second picture attached)
P(z1 < z < z2) = 0.9192 - 0.0968 = 0.8224