6 because in 9 years Travis will be 30 and divide that by 2 is 15. 15-9=6
Answer:
a) Normal Distribution
b) 0.146
c) 0.070
Step-by-step explanation:
We are given the following information in the question:
The number of accidents per week at a hazardous intersection varies with mean 2.2 and standard deviation 1.4
a)
: mean number of accidents per week at the intersection during a year (52 weeks)
According to central limit theorem, as the sample size becomes larger, the distribution of mean approaches a normal distribution.
Since we have a large sample, the approximate distribution of
is a normal distribution with

b) P(mean is less than 2)
Formula:

P(x > 610)

Calculation the value from standard normal z table, we have,

c) P(fewer than 100 accidents at the intersection in a year)
P(x < 100)

Calculation the value from standard normal z table, we have,

The length is 14 yd and the width is 7 yd because 7•2=14 and 14•7= 128 yd²
The frequency table is attached.
Since there were 30 people out of the 60 that received cold medicine, that means that 60-30=30 people did not.
Since 26 people had a cold longer than 7 days, this means 60-26=34 had a cold that was less than or equal to 7 days.
14 people had a cold longer than 7 days and received medicine; this means that 26-14=12 people had a cold longer than 7 days and did not receive medicine.
30-14=16 people received medicine and had a cold less than or equal to 7 days.
30-12=18 people did not receive medicine and had a cold less than or equal to 7 days.