In [40]:

```
import random
import math
num_rand_vals = 100
min_value = 1
max_value = 6
rand_vals = []
print "Roll: number"
for i in xrange(num_rand_vals):
val = random.randint(min_value, max_value)
rand_vals.append(val)
if (i < 10):
print "%d: %d" % (i, val)
```

Roll: number 0: 4 1: 3 2: 2 3: 3 4: 3 5: 6 6: 4 7: 2 8: 1 9: 4

In [41]:

```
min_seen = min(rand_vals)
max_seen = max(rand_vals)
mean_seen = (sum(rand_vals)+0.0) / len(rand_vals)
print "When simulating %d random values between %d and %d" % (num_rand_vals, min_value, max_value)
print "The smallest I saw was %d" % (min_seen)
print "The biggest I saw was %d" % (max_seen)
print "And the mean value was %.02f" % (mean_seen)
```

In [42]:

```
## Plot the individual vals
plt.figure()
plt.xlabel("Roll Index")
plt.ylabel("Result")
plt.scatter(range(num_rand_vals), rand_vals)
plt.show()
```

In [43]:

```
## summarize how many times we saw each value
tally = [0 for x in xrange(max_value+1)]
for i in rand_vals:
tally[i] += 1
print "value #times_seen"
for t in xrange(len(tally)):
print "%d: %d" % (t, tally[t])
```

value #times_seen 0: 0 1: 14 2: 22 3: 15 4: 19 5: 18 6: 12

In [44]:

```
print "We expected to see the number 6 %.02f percent of the time = %d times" % (100./6, num_rand_vals/6)
print "We actually saw 6 %d times" % (tally[6])
```

We expected to see the number 6 16.67 percent of the time = 16 times We actually saw 6 12 times

In [45]:

```
## summarize the tally
mean_tally = (sum(tally) + 0.) / (len(tally)-1) ## skip 0
min_tally = tally[1]
sumdiff = 0.0
for i in xrange(min_value, max_value+1):
diff = (tally[i] - mean_tally) ** 2
sumdiff += diff
if (tally[i] < min_tally):
min_tally = tally[i]
sumdiff /= (len(tally)-1)
stdev_tally = math.sqrt(sumdiff)
print "the minimum tally was %d" % (min_tally)
print "the maximum tally was %d" % (max(tally))
print "the mean tally was %.02f +/- %.2f" % (mean_tally, stdev_tally)
```

the minimum tally was 12 the maximum tally was 22 the mean tally was 16.67 +/- 3.35

In [46]:

```
## plot the tally, a histogram
plt.figure()
plt.xlabel("Value")
plt.ylabel("Number of occurences")
plt.bar(range(max_value+1), tally)
plt.show()
```

In [47]:

```
## The hist function will do everything for us in one step
plt.figure()
plt.xlabel("Value")
plt.ylabel("Number of occurences")
plt.hist(rand_vals, bins=range(max_value+2))
plt.show()
```

In [49]:

```
## The hist function can also plot the probability of each number, i.e. the density function
plt.figure()
plt.xlabel("Value")
plt.ylabel("Percent of occurences")
plt.hist(rand_vals, bins=range(max_value+2), normed=True)
plt.show()
```