Answer:
Step-by-step explanation:
Since the scores of the math test are normally distributed, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = math test scores.
µ = mean score
σ = standard deviation
From the information given,
µ = 76
σ = 5
The probability that a student scored below 65 is expressed as
P(x < 65)
For x = 65
z = (65 - 76)/5 = - 2.2
Looking at the normal distribution table, the probability corresponding to the z score is 0.014
The percentage of students that scored below 65 is
0.014 × 100 = 1.4%
Answer:
D) 1.0*10^7
Step-by-step explanation:
10,000,000
10,000*10^3
10*10^6
1.0^10^7
Scientific notation requires the following formula:
(a and c are digits, b is the value after the decimal point)
a.b*10^c
The tv is 1420 he paid 1020 for it which is 400 off the original cost thus he had a 3.55% or you could round it to a 4% disount
Let the average cost of car in 2009 be $x, then the average cost of a car in 2013 is 2x - 5
25,000 = 2x - 5
2x = 25,000 + 5 = 25,005
x = 25,005/2 = $12,502.50