Answer: About 13.79% of the plants will have a height of less than 6.0 feet.
To answer this question, we first need to know how many standard deviations it is below the mean. That is called the z-score.
To find the z-score, we determine the difference of the expected value and the mean. Then, we divide that by the standard deviation.
(6 - 8.4) / 2.2 = -1.09
A height of 6 is -1.09 standard deviations below the mean. Looking up the probability for a z-score of -1.09 gives us a value of 13.79%.
She will start resting for the fourth time in 60 seconds
He is now 69 years old because i am smarter than you.
He starts saving $ in January to buy a gift in June. (which is 6 months, or 5 months not including June)
Each month he saves 2/3 of his allowance, which is $14.
[his allowance each month is $21, 2/3 of his allowance is $14]
(you multiply 21 by 2/3 = 42/3 = 14)
The gift he wants to buy is $110
x = the number of months
y = total cost
14x = y
14x = 110 [he saves $14 each month, he wants to have a total of $110 to buy a gift]
Plug in 6 for x in the equation
14(6) = 110
84 = 110 (He is $26 short, so saving either for 5 or 6 months will not get Ian $110)
Ian will not have enough money because he is $26 short for 6 months or $40 short for 5 months. (you can decide whether you want to go by 5 months or 6(including June), sorry for the confusing answer)
